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A frontier market is a type of country that is not a developed market. The term is an economic term which was coined by International Finance Corporation’s Farida Khambata in 1992. The term is commonly used to describe the equity markets of the smaller and less accessible, but still "investable", countries of the developing world. The frontier, or pre-emerging equity markets are typically pursued by investors seeking high, long-run return potential as well as low correlations with other markets. It is used for countries that were in the past emerging markets.
The term began use when the IFC Emerging Markets Database (EMDB), led by Farida Khambata, began publishing data on smaller markets in 1992. Khambata coined the term “Frontier Markets” for this set of indices. Standard and Poor's bought EMDB from IFC in 1999 and in October 2007, S&P launched the first investable index, the Select Frontier Index (30 of the largest companies from 11 countries) and the Extended Frontier Index (150 companies from 27 countries0. Subsequently, MSCI Barra began a rival frontier market index, and in early 2008, Deutsche Bank launched the first frontier market exchange-traded fund, on the London Stock Exchange. Frontier markets are a sub-set of emerging markets, which have market capitalizations that are small and/or low annual turnover and/or market restrictions unsuitable for inclusion in the larger EM indexes but nonetheless "demonstrate a relative openness to and accessibility for foreign investors" and are not under "extreme economic and political instability."
Members could be considered to fall roughly into three groups:
Frontier Markets have lower market capitalization and liquidity than the more developed, "traditional" emerging markets. The frontier equity markets are typically pursued by investors seeking high, long term returns and low correlations with other markets 
The implication of a country being labeled as Frontier is that, over time, the market will become more liquid and exhibit similar risk and return characteristics as the larger, more liquid developed emerging markets.
Emerging market / frontier investors say investing in frontier assets would actually diversify and reduce risk, which contradicts the general notion that risk would be added by including those markets. This view has also been reinforced by other well known investors such as Thomas Hugger of Asia Frontier Capital Ltd. and Douglas Clayton of Leopard Capital.
Those who have a focus on frontier markets have different views on what the future holds for the inter-correlation of countries within the asset class. Whilst they share some economics characteristics such as young, increasing educated populations the individual economies face different internal and external forces. Funds such as Asia Frontier Capital invest to find returns in countries that have increasing trends in domestic consumption but see the overall growth drivers for each country as being different. This investment thesis holds water as it is unlikely that a manufacturing based economy, such as Bangladesh, would respond in the same way to external shocks as an island nation where a large proportion of the economy is linked to tourism, such as Sri Lanka.
Other investors such as DaMina Advisors, the leading global Africa-focused frontier markets risk analysis firm has argued since 2010 that fundamentally all the world’s last remaining frontier capital markets in Africa, Latin America and Asia will become synchronized – just as the globally and culturally disparate largest emerging markets of Brazil, India, China and Russia have become.
There are also other non managed ways to gain exposure to these markets that are more generic such as investing in frontier market indices such as MSCI Frontier Index that only invest in large liquid stocks.
FTSE classification, as of September 2010 frontier markets list:
The following countries are currently not included in MSCI Frontier Markets Index, and adding them to this list - is still under consideration (as of May 2010):
Colombia was promoted to Emerging market effective September 19, 2011 
As of May 2013, Russell Investments considers the following countries frontier markets: