Cicero's rhetorical works — De Inventione, De Oratore, Brutus, Orator — constitute the most systematic surviving ancient treatment of persuasion, argumentation, and style. They shaped Western education for nearly two thousand years and remain useful as analytical frameworks even for modern communication.

The De Oratore, a dialogue set in 91 BC featuring the leading Roman orators of the previous generation, is the most ambitious: it argues that the ideal orator must have comprehensive knowledge, not merely technical skill. The Socratic ideal of knowledge as prerequisite for argument is adapted to Roman political conditions, where effective oratory required knowledge of law, history, philosophy, and human psychology.

Cicero's distinction between the three functions of rhetoric — docere (teach), delectare (please), and movere (move) — is still a useful framework for analyzing communicative effectiveness. Different situations call for different mixes: a technical legal argument needs more docere; a political speech needs more movere; pure epideictic (ceremonial) rhetoric aims primarily at delectare.

The Brutus is a historical survey of Roman oratory from its beginnings to Cicero's own time — essentially the first history of rhetoric. Its portraits of the orators Cicero knew are invaluable biographical sources. The Orator contains what may be the most sophisticated ancient discussion of prose rhythm and style — technical enough to seem obscure but revealing about what educated Romans heard when they listened to good Latin.