Logos is a term used in Western philosophy, psychology and rhetoric, as well as religion ; among its connotations is that of a rational form of discourse that relies on inductive and deductive reasoning.

Rhetoric is the art of persuasion. It is one of the three ancient arts of discourse (trivium) along with grammar and logic/dialectic. As an academic discipline within the humanities, rhetoric aims to study the techniques that speakers or writers use to inform, persuade, and motivate their audiences. Rhetoric also provides heuristics for understanding, discovering, and developing arguments for particular situations.