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The modes of persuasion, frequently referred to as rhetorical strategies or rhetorical appeals, are devices in rhetoric that classify the speaker's appeal to the audience. They are: ethos, pathos, and logos.
Ethos (plural: ethe) is an appeal to the authority or credibility of the presenter. It is how well the presenter convinces the audience that he or she is qualified to present (speak) on the particular subject. It can be done in many ways:
Pathos (plural: pathe) is an appeal to the audience’s emotions, and the terms pathetic and empathy are derived from it. It can be in the form of metaphor, simile, a passionate delivery, or even a simple claim that a matter is unjust. Pathos can be particularly powerful if used well, but most speeches do not solely rely on pathos. Pathos is most effective when the author or speaker demonstrates agreement with an underlying value of the reader or listener.
In addition, the speaker may use pathos to appeal to fear, in order to sway the audience. Pathos may also include appeals to audience imagination and hopes; done when the speaker paints a scenario of positive future results of following the course of action proposed.
I would be presumptuous, indeed, to present myself against the distinguished gentlemen to whom you have listened if this were but a measuring of ability; but this is not a contest among persons. The humblest citizen in all the land when clad in the armor of a righteous cause is stronger than all the whole hosts of error that they can bring. I come to speak to you in defense of a cause as holy as the cause of liberty—the cause of humanity.—William Jennings Bryan
Logos (plural: logoi) is logical appeal or the simulation of it, and the term logic is derived from it. It is normally used to describe facts and figures that support the speaker's claims or thesis. Having a logos appeal also enhances ethos (see above) because information makes the speaker look knowledgeable and prepared to his or her audience. However, the data can be confusing and thus confuse the audience. Logos can also be misleading or inaccurate, however meaningful it may seem to the subject at hand. In some cases, inaccurate, falsified, or miscontextualized data can even be used to enact a pathos effect. Such as is the case with casualty numbers, which while not necessarily falsified, may include minor casualties (injuries) that are equated with deaths in the mind of an audience and therefore can evoke the same effect as a death toll.