Rhetoric has its origins in ancient Greece as a means of public speaking and persuasion. It involves using logical, ethical, and emotional appeals to argue different types of cases or topics. Aristotle was influential in establishing rhetoric as a field of study, identifying the key elements of logos, ethos, and pathos. Rhetoric continued to be developed by thinkers like Cicero and is seen as important for democracy and civilization as it allows arguments on issues and decisions about the future.