How is persuasion used in an argument

Persuasion is used in an argument through the theoretical device "Ethos".

Explanation:

Rhetorically, ethos is one of the modes of persuasion or the set of arguments used in discourse, as defined by Aristotle, the Greek philosopher. As a moral component, ethos shows the speaker's authority to influence the audience, that is, to persuade the audience through argument. Other components of speech, according to Aristotle, are logos, which is the use of reason and reasoning, and pathos, which is the application of emotion in speech.