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Television is a major mass media outlet in the United States. Household television ownership is 96.7%, and the majority of households have more than one. Peak ownership occurred in the 1996-1997 broadcast season with 98.4% ownership.  As a whole, the television networks of the United States are the largest and most syndicated in the world.
As of August 2013, approximately 114,200,000 American households have television.
In the United States television is available via broadcast ("over-the-air"), unencrypted satellite ("free-to-air"), direct broadcast satellite, cable television, and IPTV (internet protocol television). There are also competing video services on the world wide web.
Over-the-air and free-to-air TV is free with no monthly payments while cable, direct broadcast satellite, and IPTV require monthly payments that vary depending on the number of channels a subscriber chooses. Channels are usually sold in groups, rather than singly.
The United States has a decentralized, market-oriented television system. The United States has a national public broadcast service known as the Public Broadcasting Service (PBS). Local media markets have their own television stations, which may be affiliated with or owned and operated by a TV network. Stations may sign affiliation agreements with one of the national networks. Except in very small markets with few stations, affiliation agreements are usually exclusive: If a station is an NBC affiliate, the station would not air programs from ABC, CBS or other networks.
However, to ensure local presences in television broadcasting, federal law restricts the amount of network programming local stations can run. Until the 1970s and '80s, local stations supplemented network programming with a good deal of their own produced shows. Today, however, many stations produce only local news shows. They fill the rest of their schedule with syndicated shows, or material produced independently and sold to individual stations in each local market..
The five major U.S. networks are NBC, CBS, ABC, Fox, and The CW. The first three began as radio networks: NBC and CBS in the 1920s, and ABC was spun off from NBC in 1943. Fox is a relative newcomer that began in 1986, although it is built upon the remnants of the former DuMont Television Network, which was an earlier "fourth network" that operated from 1948 to 1956. The CW was created in 2006 when UPN merged with the terrestrial and cable assets of The WB (The WB's online assets remain separate). All in all, the US broadcasting landscape dramatically evolved towards a conglomeratization of players—an effect also called Concentration of media ownership, which describes the narrowing of competition in modern television broadcasting.
Weekday schedules on ABC, CBS, and NBC affiliates tend to be similar, with programming choices sorted by dayparts (Fox does not air network programming outside of prime time other than weekend sports programming). Typically, they begin with an early-morning local news show, followed by a network morning show, such as NBC's Today, which mixes news, weather, interviews and music.
Network daytime schedules consist of talk shows and soap operas, with one network (CBS) still carrying game shows and a handful of other games airing in syndication; local news may air at midday. Syndicated talk shows appear in the late afternoon, followed by local news again in the early evening. ABC, CBS and NBC offer network news, generally at 6:30 or 7:00 in the Eastern Time zone and 5:30 or 6:00 in other areas. Local newscasts or syndicated programs fill the "prime access" hour or half-hour, and lead into the networks' prime time schedules, which are the day's most-watched three hours of television.
Typically, family-oriented comedy programs led in the early part of prime time, although in recent years, reality television like Dancing with the Stars has largely replaced them. Later in the evening, dramas like CSI: Crime Scene Investigation, House M.D., and Grey's Anatomy air.
At the end of prime time, another local news program comes on, usually followed by late-night interview shows, such as Late Show with David Letterman or The Tonight Show. Rather than sign off for the early hours of the morning (as was standard practice until the early 1970s in larger markets and until the mid-1980s in smaller ones), TV stations now fill the time with syndicated programming, reruns of prime time television shows or the late local news, or 30-minute advertisements, known as infomercials, and in the case of CBS and ABC, overnight network news programs.
Saturday mornings usually feature network programming aimed at children (including animated cartoons), while Sunday mornings include public-affairs programs. Both of these help fulfill stations' legal obligations, to provide educational children's programs and public-service programming respectively. Sports and infomercials can be found on weekend afternoons, followed again by the same type of prime-time shows aired during the week.
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From 1955 until 1986, all English-language stations not affiliated with the big three networks were independent, airing only locally produced and syndicated programming. Many independent stations still exist in the U.S., usually historically broadcasting on the UHF band. Syndicated shows, often reruns of old TV series and old movies, take up much of their schedule.
In 1986, however, the Fox Broadcasting Company launched a challenge to the big three networks. Thanks largely to the success of shows like The Simpsons, as well as the network's acquisition of rights to show National Football League games, Fox has established itself as a major player in broadcast television. However, Fox differs from the three older networks in that it does not air daily morning and nightly news programs or have network-run daytime or weeknight late night schedules (though late night shows do air on Saturday nights) Its nightly prime-time schedule is only two hours long (three hours on Sundays), and some of its big-city affiliates broadcast on UHF before the transition to digital. Many of its smaller-market affiliates outsource news production to Big Three affiliates rather produce their own newscasts, and its flagship stations in New York and Los Angeles do not include the network's name within their callsigns (Fox's New York and Los Angeles stations instead use the callsigns WNYW and KTTV, respectively).
Fox's only scheduled news program is Fox News Sunday, on Sunday mornings; special news coverage on Fox comes from the staff of cable's Fox News Channel, though not all affiliates carry breaking news bulletins from Fox News outside of primetime presidential addresses. Most Fox affiliates now have local newscasts, in primetime usually airing an hour earlier competing with network dramas, rather than other local newscasts, and in the morning for two additional hours.
Three new networks launched in the 1990s: The WB (1995), UPN (1995), and PAX (1998). (PAX became i: Independent Television in 2005, and then Ion Television in 2007). The fledging WB and UPN merged into The CW in fall 2006, while News Corporation's MyNetworkTV—created to replace UPN programming on Fox's O&Os—debuted in fall 2006.
Ion broadcasts 24 hours a day, seven days a week, though only eleven hours of its schedule on Saturday through Tuesdays and twelve hours on Wednesday through Fridays consist of entertainment programming. Infomercials and religious programming make up the remainder of the schedule. This makes the Ion network the largest English-language commercial television network that is totally responsible for its affiliates' programming—though it mostly airs infomercials outside its prime time.
The CW broadcasts ten hours a week in prime time (Monday through Fridays only) and five hours in Saturday daytime. MyNetworkTV started as a full network, then after repeated low ratings in prime time, downgraded into a "broadcast syndication service" that broadcasts reruns of other networks' series ten hours a week Monday through Friday.
Univision, a network of Spanish language stations, is the fifth-largest TV network behind NBC, CBS, ABC and Fox. Its major competition is Telemundo, a sister network of NBC. Univision-owned UniMas, aimed at a younger Hispanic demographic, Azteca América, the American version of Mexico's Azteca, and Estrella TV are other popular Spanish-language over-the-air networks. Upstart MundoFox started broadcasting in 2012.
French programming is generally limited in scope, with some locally produced French and creole programming available in the Miami area (serving refugees from Haiti) and Louisiana, along with some places along the heavily populated Eastern Seaboard. French-speaking areas near the eastern portion of the Canada-United States border generally receive their television broadcasts from French Canadian channels, which are widely available over the air and on cable in those areas.
There have also been a few, local stations in American Sign Language accompanied by closed captioned English. Prior to the development of closed captioning, it was not uncommon to see some public television broadcasts translated into ASL by an on-screen interpreter.
Public television has a far smaller role than in most other countries. The federal government does produce NASA TV (three channels featuring space program information and educational programs) and The Pentagon Channel (a military news outlet) for public consumption, but distributes them only via satellite and Internet and not through terrestrial outlets. In addition, Broadcasting Board of Governors content (the most well-known being Voice of America) have been available to U.S. consumers since the partial repeal of the Smith–Mundt Act in 2013; VOA and its sister outlets are likewise restricted to shortwave and Internet broadcasts. However, a number of states—including Wisconsin, Maryland, Minnesota, and South Carolina—do have state-owned public broadcasting authorities that operate and fund all public television stations in their respective states. The Alabama Educational Television Commission, licensee for the nine Alabama Public Television stations, was established by the Alabama Legislature in 1953. In January 1955, WCIQ on Mount Cheaha began operation as the nation's ninth non-commercial television station. Four months later, with the sign-on of WBIQ in Birmingham, Alabama became the first state in the nation with an educational television network. Alabama Public Television made its first broadcast as a network in April 1955.
Alabama Public Television was a model for other states in the nation and for television broadcasters in other countries. Twenty-five other states copied Alabama's system of operation to provide service through multiple, linked television stations. The federal government does subsidize non-commercial educational television stations through the Corporation for Public Broadcasting. The income received from the government is insufficient to cover expenses and stations rely on corporate sponsorships and viewer contributions.
American public television stations air programming that commercial stations do not offer, such as educational, including cultural and arts, and public affairs programming. Most (but by no means all) public TV stations are affiliates of the Public Broadcasting Service, sharing programs like Sesame Street and Masterpiece Theatre. Unlike the commercial networks, PBS does not officially produce any of its own programming; instead, individual PBS stations, station groups and affiliated producers create programming and provide these through PBS to other affiliates; there are also a number of syndicators dealing exclusively or primarily with public broadcast stations, both PBS and independent stations; additionally, there are a number of smaller networks feeding programming to public stations, including World, Create, and MHz Worldview; the German public broadcaster Deutsche Welle has also provided blocks of programming to a variety of affiliates in the US, and increasingly feeds from other national broadcasters have been playing through digital channels belonging to public stations in the US. New York City's municipally-owned broadcast service, NYCTV, creates original programming that airs in several markets. Few cities have major municipally-owned stations.
Many religious broadcasting networks and stations exist, also surviving on viewer contributions and time leased to the programming producers, including Trinity Broadcasting Network, Three Angels Broadcasting Network, Hope Channel, Amazing Facts Television, Daystar Television Network, The Word Network, The Worship Network, Total Christian Television, and INSP.
While pay television systems existed as early as the late 1940s, until the early 1970s cable television only brought distant over-the-air TV to rural areas without local stations. This role was reflected in the original meaning of the CATV acronym: community antenna TV. In that decade, national networks dedicated exclusively to cable broadcasting appeared along with cable-TV systems in major cities with over-the-air TV. By the mid-1970s some form of cable-TV was available in almost every market that already had over-the-air TV. Today, most American households receive cable TV, and cable networks collectively have greater viewership than broadcast networks.
Unlike broadcast networks, most cable networks air the same programming nationwide. Top cable networks include USA Network (general entertainment), ESPN and Fox Sports (sports), MTV (music and reality TV), CNN and Fox News (news), Syfy (science fiction), Disney Channel (family), Nickelodeon and Cartoon Network (Children's), Discovery Channel and Animal Planet (documentaries), TBS (comedy), TNT and FX (drama) and Lifetime (women's).
The national cable TV network became possible in the mid-1970s with the launch of domestic communication satellites that could economically broadcast TV programs to cable operators anywhere in the continental US. (Some domestic satellites also covered Alaska and Hawaii with dedicated spot beams.) Until then, cable networks like HBO had been limited to regional coverage by expensive terrestrial microwave links leased from the telephone companies (primarily AT&T). Satellites were generally used only for international (i.e., transoceanic) communications; their antennas covered an entire hemisphere, producing weak signals that required large, expensive receiving antennas. The first domestic communications satellite, Westar 1, was launched in 1974. By concentrating its signal on the continental United States with a directional antenna, Westar 1 could transmit to TVRO ("TV, receive only") dishes only a few meters in diameter, well within the means of local cable TV operators.
Cable system operators now receive programming by satellite, terrestrial optical fiber, off the air, and from in-house sources and relay it to subscribers' homes. Usually, local governments award a monopoly to provide cable-TV service in a given area. By law, cable systems must include local over-the-air stations in their offerings to customers.
Enterprising individuals soon found they could install their own satellite dishes and eavesdrop on the feeds to the cable operators. The signals were transmitted as unscrambled analog FM that did not require advanced or expensive technology. Since these same satellites were also used internally by the TV networks they could also watch programs not intended for public broadcast such as affiliate feeds without commercials and/or intended for another time zone; raw footage from remote news teams; advance transmissions of upcoming programs; and live news and talk shows during breaks when those on camera might not realize that anyone outside the network could hear them.
Encrypting was introduced to prevent people from receiving pay content for free, and nearly every pay channel was encrypted by the mid to late 1980s. (This did not happen without protest; see Captain Midnight (HBO)). Satellite TV also began a digital transition, well before over the air broadcasting did the same, to increase satellite capacity and/or reduce the size of the receiving antennas, and this also made it more difficult for individuals to intercept these signals.
Eventually the industry began to cater to individuals who wanted to continue to receive satellite TV (and were willing to pay for it) in two ways: by authorizing the descrambling of the original satellite feeds to the cable TV operators and with new direct broadcast satellite television services using their own satellites.
These latter services, which began in the mid-1990s, offer programming similar to cable TV. DirecTV and Dish Network are the major DBS providers in the country, with 20 and 14 million customers respectively as of February 2014. Meanwhile, the major cable television providers are Comcast with 22 million customers, Time Warner Cable with 11 million, and Cox Communications, Charter Communications, AT&T U-Verse and Verizon FiOS with 5-6 million each.
Although most networks make viewers pay, some networks are broadcasting unencrypted feeds. After broadcast TV switched to all digital, new channels became available on unencrypted satellites to bring more free TV to Americans some of these are available as a digital subchannel to local broadcasters, this reason may be for the expensive costs of the DVB-S equipment. NASA TV, Pentagon Channel, ABC News Now, ThisTV, TheCoolTV, and Retro Television Network (through its affiliates) are examples, international news channels like Al Jazeera English are commonly watched this way as a result to the lack of availability on cable, DBS and IPTV.
Some cable providers use interactive features in their set-top boxes to distribute video on demand within their internal networks.
IPTV is similar to a cable subscription, but instead of the set-top box receiving information via a dedicated wire, video is transmitted over the public Internet or private Internet Protocol-based network to a set-top box.
Over-the-top content bypasses multiple system operators entirely, and allows viewing of programs hosted by independent providers. Web television began in the 1990s and has become popular in the 2000s, resulting in a trend of cord cutting - canceling cable subscription in favor of online content, over-the-air broadcasts, and DVD rental. Web TV providers in the United States include Hulu, Netflix (which was originally a mail-order DVD rental service), MyTV (Arabic), and many international web sites such as YouTube, Myspace, Newgrounds, Blip, and Crackle. Viewers can watch these programs from any web browser, whether on a desktop computer, laptop, tablet, or smartphone. Mobile television services also include mobile apps for both traditional and new programming providers, usually optimized for a small screen and mobile bandwidth constraints. Mobile video is available for direct download or streaming from the iTunes Store, Google Play, and Amazon Instant Video.
Internet-connected video game consoles and dedicated Smart TV boxes are available that connect televisions to online video services. These services are marketed as more convenient for consumers who would otherwise have trouble connecting a computer to a full-size television and using a web browser to view content. Some televisions have built-in capabilities; dedicated boxes include Google TV, Apple TV, Roku, Netgear Digital Entertainer, Amkette EvoTV, and formerly the Nexus Q. Devices that require a PC and television include Windows Media Center Extender, HP MediaSmart Connect, Boxee, and Hauppauge MediaMVP.
Over-the-air commercial stations and networks generate the vast majority of their revenue from advertisements. According to a 2001 survey, broadcast stations allocated 16 to 21 minutes per hour to commercials. Most cable networks also generate income from advertisements, although most basic cable networks also receive subscription fees. However, premium cable networks, such as the movie network HBO, do not air commercials. Instead, cable TV subscribers must pay extra to receive the premium networks.
In the days of broadcast television,[when?] networks allocated a portion of commercial time for their shows to the local affiliates, which allowed the local stations to generate revenue. In the same manner, cable-TV system operators generate some of their revenue by selling local commercial time for each cable network being broadcast. The other main source of revenue for the cable-TV operators is subscription fees.
Cable companies are required by the 1992 Cable Television Consumer Protection and Competition Act to negotiate for retransmission consent, usually paying broadcasters for the right to carry their signals.
American television has had very successful programming that has inspired television networks across the world to make shows of similar types or broadcast these shows in their own country. Some of these shows are still on the air and some are still alive and well in syndication. The opposite is also true; a number of popular American programs were based on shows from other countries, especially the United Kingdom and Canada. US television companies also copied some formats from the Netherlands such as Big Brother and The Voice.
The major networks all offer a morning news program, with CBS's CBS This Morning, NBC's The Today Show and ABC's Good Morning America as standard bearers, as well as an early-evening newscast anchored by the de facto face of the network's news operations like Walter Cronkite and Dan Rather for CBS; Chet Huntley, David Brinkley and Tom Brokaw for NBC; and Peter Jennings for ABC. Successful news magazines have included 60 Minutes, 20/20, Dateline in primetime and Meet the Press, Face the Nation and This Week on Sunday mornings.
Daytime television has been home of many popular game shows over the years, particularly during the 1970s, such as The Price is Right, Family Feud, Match Game, The Newlywed Game and Concentration. Wheel of Fortune and Jeopardy! have found their greatest success in the early-evening slot before primetime. However, game shows also aired within primetime had great popularity in the 1950s and 1960s with shows such as What's My Line?, I've Got a Secret and To Tell the Truth; and again, intermittently, in the 2000s with Who Wants to Be a Millionaire, The Weakest Link and Deal or No Deal. The Price Is Right, which has appeared on CBS since 1972, was the only daytime game show remaining on the broadcast networks for fifteen years until CBS announced it would be joined by a remake of Let's Make a Deal in October 2009.
American daytime soap operas have been running for over seven decades. Currently, there are four daytime soap operas in production: General Hospital, Days of our Lives, The Young and the Restless and The Bold and the Beautiful. Long-running soaps no longer in production include Search for Tomorrow, Guiding Light, As the World Turns, Another World, One Life to Live, and All My Children. Primetime soap operas of note have included Peyton Place, Dallas, Dynasty, Beverly Hills, 90210 and Revenge.
Primetime comedy has included situation comedies such as I Love Lucy, The Honeymooners, The Andy Griffith Show, The Dick Van Dyke Show, The Mary Tyler Moore Show, All in the Family, M*A*S*H, Happy Days, Family Ties, Cheers, The Cosby Show, Seinfeld, Friends, Everybody Loves Raymond, King of Queens, How I Met Your Mother, The Big Bang Theory and Modern Family as well as sketch comedy/variety series such as Texaco Star Theatre, The Carol Burnett Show, Rowan and Martin's Laugh-In and Saturday Night Live.
Dramatic series have taken many forms over the years. Westerns such as Gunsmoke had their greatest popularity in the 1950s and 1960s. Medical dramas such as Marcus Welby, M.D., St. Elsewhere, ER, House and Grey's Anatomy have endured success, as well as family dramas like The Waltons and Little House on the Prairie, and crime dramas such as Dragnet, Hawaii Five-O, Hill Street Blues, Miami Vice, L.A. Law, 21 Jump Street, Law & Order, JAG, CSI: Crime Scene Investigation and NCIS.
Dramedy, a term for a television series that mixes comedy with drama, have seen its popularity grown among viewers, thanks to programs like Ally McBeal, Ugly Betty, Desperate Housewives, Devious Maids, and Glee.
Television series featuring fantasy and science fiction are also popular with American viewers, since these programs take elements of comedy, drama, adventure, or a combination of all of the above. Among the most notable fantasy series in this genre include Touched By an Angel (angels helping humans in times of personal crisis), Bewitched (a witch adjusting to married life), Fantasy Island (a resort where people live out their fantasies, but a price), Drop Dead Diva (a deceased model inhabiting the body of a lawyer), and Once Upon a Time (fairytale characters trapped in the present day after a curse was enacted), while Star Trek, Battlestar Galactica and the British series Doctor Who rank among the most watched programs in the sci-fi genre.
Reality television has long existed in the United States, both played for laughs (Candid Camera, Real People) and as drama (COPS, The Real World). A new variant - competition series placing ordinary people in unusual circumstances or in talent contests, generally eliminating one participant per week, exploded in popularity in turn of the millennium with shows such as Survivor, Big Brother, The Amazing Race, American Idol, America's Next Top Model, So You Think You Can Dance and The Voice.
The most successful talk show has been the The Tonight Show, particularly during the 29-year run of third host Johnny Carson. Tonight ushered in a multi-decade period of dominance by one network in American late-night programming and paved the way for many similar combinations of comedy and celebrity interviews, such as The Merv Griffin Show and Late Night with David Letterman. Daytime talk show hits have included Live with Regis and Kelly, The Oprah Winfrey Show, Dr. Phil and The Ellen DeGeneres Show run the gamut from serious to lighthearted; a subset of so-called trash TV talk shows such as The Jerry Springer Show also veered into exploitation and titillation.
Children's television programs are also quite popular. Early ventures into children's television in the 1950s aired on weekdays with shows like Howdy Doody, Captain Kangaroo and The Mickey Mouse Club. However children's programing had its greatest success on Saturday mornings from the 1960s to the early 1990s. Programs shown during these hours mainly consisted of animated programming including classic Looney Tunes, Tom and Jerry, Woody Woodpecker and Terrytoons cartoons, reruns of primetime animated sitcoms like The Flintstones and The Jetsons, foreign acquisitions like Astro Boy and Kimba the White Lion, animated adaptaions of Back to the Future, Ghostbusters, Batman, ALF and Star Trek, as well as the original broadcasts of The Rocky and Bullwinkle Show, Scooby-Doo, Fat Albert and the Cosby Kids, The Smurfs, Muppet Babies, Alvin and the Chipmunks, Garfield and Friends and Teenage Mutant Ninja Turtles. In recent years however, the FCC has introduced E/I restrictions that require all over-the-air broadcast stations to show at least three hours of educational children's programming a week. This has made it much harder for broadcast stations to profit from children's programs compared to previous years, though PBS excels in E/I programming with shows like Sesame Street, Mister Rogers' Neighbourhood, Teletubbies, Thomas the Tank Engine, and Arthur. Today the most popular children's programing has migrated to cable television networks like Disney Channel, Nickelodeon and Cartoon Network who are completely exempt from E/I restrictions. Their successful content has included Rugrats, SpongeBob SquarePants, The Fairly OddParents, Kim Possible, Hanna Montana, iCarly, Phineas & Ferb, Wizards of Waverly Place, and Adventure Time, amongst others.
While the majority of programs broadcast on United States television are produced domestically, some programs carried in syndication, on public television or on cable television are imported from outside the U.S.; most commonly, these imported programs come from the primarily English-speaking countries of Canada and the United Kingdom. PBS in particular, is commonly known for its broadcasts of British comedies such as Monty Python's Flying Circus, Fawlty Towers, Are You Being Served?, Keeping Up Appearances and As Time Goes By, which typically air on most PBS member stations on weekend evenings. As for Canadian programs, most of the programming imported from Canada includes children's programs from family-oriented specialty channels YTV and Family such as Are You Afraid of the Dark?, Naturally, Sadie and Life with Derek. Among some of the more well-known Canadian television series among American viewers include the Degrassi High franchise (which aired in Canada on CBC Television, with the later incarnation Degrassi: The Next Generation airing on CTV and presently MuchMusic), SCTV Network and The Red Green Show. American Spanish-language networks also import much of their programming; for example, Univision imports much of its programming, especially telenovelas that are broadcast on the network, from Mexican broadcaster Televisa and Venezuelan broadcaster Venevision.
Television production companies either commission teleplays for TV pilots or buy spec scripts. Some of these scripts are turned into pilots. The production company markets those they consider commercially viable to television networks—or television distributors for first-run syndication. (KingWorld distributes The Oprah Winfrey Show in first-run syndication, for example, because that show is syndicated—is not affiliated with a particular network.) A few things in consideration for a TV network to pick up a show is if the show itself is compatible with the network's target audience, the cost of production, and if the show is well liked among network executives.
Networks sometimes preemptively purchase pilots to prevent other networks from controlling them—and the purchase of a pilot is no guarantee the network will order more episodes. Pilots that do get "picked up" get either a full or partial-season order. The show goes into production, usually establishing itself with permanent sets, a full crew and production offices. The producers hire writers, directors, and crew, and work begins—usually during the late spring and summer before the fall season-series premieres. (Shows can also be midseason replacement, meaning they are ordered specifically to fill holes in a network schedule created by the failure and cancellation of shows that premiered in the fall. Buffy the Vampire Slayer and The Office are examples of successful midseason replacements.)
The standard broadcast television season in the United States is 22 episodes per season; sitcoms may have 24 or more; animated programs may have more (or fewer) episodes; cable networks with original programming seem to have settled on about 10 or 12 episodes per season, much in line with British television programming.
American soap operas air in the afternoon, five days a week, without any significant break in taping and airing schedules throughout the year. This means that these serials air approximately 260 episodes a year, making their casts and crews the busiest in show business. These shows are rarely, if ever, repeated, making it difficult for viewers to "catch up" when they miss programming. However, the now-defunct cable channel SOAPnet provided weekly repeats for some broadcasts.
Networks use profits from commercials run during the show to pay the production company, which in turn pays the cast and crew, and keeps a share of the profits for itself. (Networks sometimes act as both production companies and distributors.) As advertising rates are based on the size of the audience, measuring the number of people watching a network is very important. This measurement is known as a show or network's ratings. Sweeps months (November, February, May, and to a lesser extent July) are important landmarks in the television year — ratings earned during these periods determining advertising rates until the next sweeps period, therefore shows often have their most exciting plot developments happen during sweeps.
Shows that are successful with audiences and advertisers receive authorization from the network to continue production, until the plotline ends (only for scripted shows) or if the contract expires. Those that are not successful are often quickly told to discontinue production by the network, known as cancellation. There are instances of initially low-rated shows surviving cancellation and later becoming highly-popular, but these are rare. For the most part, shows that are not immediately or even moderately successful are cancelled by the end of November sweeps. Usually if a show is canceled, there is little chance of it ever coming back again especially on the same network it was canceled from; the only show in the US to ever come back from cancellation on the same network is Family Guy. However, canceled shows like Scrubs, Southland, Medium, and Wonder Woman have been picked up by other networks, which is becoming an increasingly common practice. It is also somewhat common for series to continue production on a series for the purpose of completing a DVD set, even if these episodes never air on television (these episodes would, in years past, be "burned off" by airing them in less-prominent time slots).
Once a television series reaches a threshold of approximately 88 to 100 episodes, it becomes a candidate to enter reruns in off-network syndication. Reruns are a lucrative business for television producers, who can sell the rights to a "used" series without the expenses of producing it (though they may have to pay royalties to affected parties, depending on union contracts).
Sitcoms are traditionally the most widely syndicated reruns and are usually aired in a five-day-a-week strip. Marginally performing shows tend to last less than five years in broadcast syndication, sometimes moving to cable channels or into limited-run barter syndication (such as through The Program Exchange) after the end of their syndication runs, while more widely successful series can have a life in syndication that can run for decades (I Love Lucy, the first series designed to be rerun, remains popular in syndication sixty years after its debut).
Cable networks and digital broadcast channels have provided outlets for programming that either has outlived its syndication viability, lacks the number of episodes necessary for syndication, or for various reasons was not a candidate for syndication in the first place. Popular dramas, for instance, have permanent homes on several basic cable channels, often running in marathons (multiple episodes airing back-to-back for several hours), and there are also cable channels devoted to game shows (Game Show Network), soap operas (the defunct SoapNet), Saturday morning cartoons (e.g. Boomerang) and even sports broadcasts (ESPN Classic). Most reality shows perform poorly in reruns, and are rarely seen as a result—other than as filler reruns of series still in production (almost always on cable outlets).
Broadcast television is regulated by the Federal Communications Commission (FCC). The FCC awards licenses to local stations, which stipulate stations' commitments to educational and public-interest programming. The FCC also prohibits the airing of "indecent" material over the air between 6:00 AM and 10:00 PM.
Broadcast stations can legally air almost anything they want late at night—and cable networks at all hours. However, nudity and graphic profanity are rare on American television. Such content, however, is common on pay television services that are free from FCC regulations and pressure from advertisers, and often require a subscription. Broadcasters fear that airing such material would alienate advertisers and encourage the federal government to strengthen regulation of television content.
Premium cable networks are exceptions, and often air racy programming at night, though premium channels often air program content with strong to graphic profanity, violence and nudity in some cases during the daytime hours. Some networks, such as Playboy TV, are devoted exclusively to "adult" content and therefore viewers may find scenes of simulated or graphic sexual intercourse and nudity on such channels.
Cable television is largely, but not entirely, unregulated. Cable systems must include local over-the-air stations in their offerings (see must-carry) and give them low channel numbers, unless the stations decide to demand compensation of any sort (see retransmission consent).
The systems cannot show broadcast-network affiliates from other parts of the country (this regulation has largely been openly ignored in recent years during carriage disputes), however cable systems can air stations out of nearby markets if there are no stations affiliated with one of the major networks (though this is becoming far less common with the existence of over-the air stations carrying one network affiliation on the main channel, and affiliating with another network on a digital subchannel, thus allowing these network-affiliated digital subchannels to be carried via digital cable).
Cable systems can also air satellite-relayed over-the-air stations originating from other areas of the United States, known as superstations (of which there are currently only six around the country, the most prominent being WGN America, which airs some programming carried by WGN-TV in Chicago), which for the most part are often aired in rural areas and if carried nationally, may have a separate feed carrying different programming than that of the local area feed that is SyndEx-proof (i.e., syndicated programming that the superstation has obtained full signal rights to) and may omit network programming from that station's network affiliation; all superstations, except for WSBK-TV in Boston, are currently affiliated with a broadcast television network as WGN-TV, WPIX in New York City, KWGN in Denver and KTLA in Los Angeles all being affiliated with The CW and WWOR-TV in Secaucus, New Jersey affiliated with MyNetworkTV.
The FCC has virtually no jurisdiction over the content of programming exclusively broadcast on cable. As a result, anyone is free to create any number of channels or any sort of programming without consulting the FCC. The only restrictions are on the ability to secure carriage on cable or satellite (or, failing that, by streaming on Internet television) and securing rights to programming.
Because of weaker U.S. copyright terms before 1976, a large body of older television series have lapsed into the public domain, and are thus free to redistribute in any form. Because of this lack of restriction, channel drift is much more common in the United States than in other countries.
After years of experimental broadcasts, television first became commercialized in the U.S. in New York City on July 1, 1941, initially by RCA (through NBC, which it owned) via their station WNBT (now WNBC) and CBS, via their station WCBW (now WCBS-TV). A number of different broadcast systems had been developed through the end of the 1930s. The National Television System Committee (NTSC) standardized on a 525-line broadcast in 1941 that would provide the basis for TV across the country through the end of the century. Television development halted with the onset of World War II, but a few pioneer stations remained on the air throughout the war, primarily WNBT, WCBW and WABD (owned by DuMont Television, now WNYW) New York, WRGB Schenectady, NY (owned by General Electric), WPTZ (now KYW-TV) Philadelphia (owned by Philco), W9XBK (now WBBM-TV) Chicago, as well as W6XAO (now KCBS-TV) and W6XYZ (now KTLA) Los Angeles. When that conflict ended, these stations expanded their broadcast schedules and many other organizations applied for television station licenses.
After a flood of television license applications, the FCC froze the application process for new applicants in 1948, due to concerns over station interference. At the time, there were only a few dozen stations operating at the end of the decade, concentrated in many (but not all) major cities. The FCC began handing out broadcasting licenses to communities of all sizes in the early 1950s, spurring an explosion of growth in the medium.
A brief dispute over the system to use for color broadcasts occurred at this time, but was soon settled. Half of all U.S. households had TV sets by 1955, though color was a premium feature for many years (most households able to purchase TV sets could only afford black-and-white models, and few programs were broadcast in color until the mid-1960s).
Many of the earliest TV programs were modified versions of well-established radio shows. Barn dances and opries were regular staples of early television, as were the first variety shows. Reruns of film shorts, such as Looney Tunes, Our Gang and The Three Stooges, were also staples of early television and to a certain extent remain popular today. The '50s saw the first flowering of the genres that would distinguish TV from movies and radio: talk shows like The Jack Paar Show and sitcoms like I Love Lucy. Although sitcoms were a radio fixture since the late 1930s (many 1940s radio sitcoms jumped directly to television), television allowed far greater use of physical comedy, an advantage that early TV sitcoms such as I Love Lucy, My Little Margie and I Married Joan used to full potential.
Other popular genera in early television were TV Westerns, police procedurals and soap operas, all of which were adapted from the radio medium; suspense thrillers, a radio staple, were less common on TV but were occasionally produced (the best known being The Twilight Zone, a mediocre performer in its time but one that has developed a major following in the decades of reruns that followed). The big band remote, for the most part, did not survive, with one exception: The Lawrence Welk Show, a big band-driven musical variety show, ran from 1951 until Welk's retirement in 1982 and in reruns from then onward. Game shows were also a major part of the early part of television, aided by massive prizes unheard of in the radio era; however, the pressure to keep the programs entertaining led to the quiz show scandals in which it was revealed many of the popular high-stakes games were rigged or outright scripted. The Saturday morning cartoons, animated productions made specifically for television (and, accordingly, with much tighter budgets and more limited animation), also debuted in the late 1950s.
Over the course of the 1960s and 1970s, concurrent with the development of color television, the evolution of television led to an event colloquially known as the rural purge; genera such as the Western, variety show, barn dance, and rural-oriented sitcom all met their demise in favor of newer, more modern series targeted at wealthier suburban and urban viewers. Around the same time, videotape became a more affordable alternative to film for recording programs.
Stations across the country also produced their own local programs. Usually carried live, they ranged from simple advertisements to game shows and children's shows that often featured clowns and other offbeat characters. Local shows could often be popular and profitable, but concerns about product promotion led them to almost completely disappear by the mid-1970s. The last remaining locally originated shows on American television as of 2012 are local newscasts and some brokered programming paid for by advertisers.
Subscription television (such as cable and satellite) became popular in the early 1980s, and has been growing in significance since then–spurring the emergence of multinational conglomerates such as Fox. As the number of outlets for potential new television channels increased, this also introduced the threat of audience fracturing, in that it would become more difficult to attain a critical mass of viewers in this highly competitive market.
As ratings declined, the number of game shows and soap operas followed, with the former genre almost completely disappearing from American daytime television, to be replaced by much cheaper and more lowbrow tabloid talk shows, many of which in turn were canceled and replaced by televised binding arbitration court shows beginning in the late 1990s.
Infomercials were legalized in 1984, approximately the same time that cable television became widespread. Over the course of the 1980s and 1990s, stations began airing infomercials throughout the night instead of signing off; infomercials also began to overtake other less-watched dayparts (such as weekends and during the daytime), which forced series that would otherwise be syndicated onto cable networks or off the air entirely. Cable networks have also begun selling infomercial space, usually in multiple-hour blocks in the early morning hours. Infomercials have earned a reputation as a medium for advertising scams and products of dubious quality.
The U.S. has now moved to digital television. U.S. networks began transitioning to recording their programs in high-definition television in the late 1990s, a process that is now mostly complete. A law passed in 2006 required over-the-air stations to cease analog broadcasting in 2009, with the end of analog television arriving on June 12 of that year.
The late 1990s also saw the invention of digital video recorders. While the ability to record a television program for home viewing was possible with the earlier VCRs, that medium was a bulky mechanical tape medium that was far less convenient than the all-digital technology DVRs used. DVR technology allowed wide-scale time shifting of programming, which had a negative impact on programming in time slots outside of prime time by allowing viewers to watch their favorite programs on demand. It also put pressure on advertisers, since DVRs make it relatively easy to skip over commercials.
During the 2000s, the major development in U.S. television was the growth of reality television, which proved to be an inexpensive and entertaining alternative to scripted prime time programming. The process of nonlinear video editing and digital recording allowed for much easier and less expensive editing of mass amounts of video, making reality television more viable than it had been in previous decades. All four major broadcast networks carry at least one long-running reality franchise in their lineup at any given time of the year.
In 2008, there were an estimated 327 million television sets in the US.