Rhetoric is

a way to trick people into believing what you want them to by lying
speaking or writing without considering your audience or purpose
the art or skill of speaking or writing formally and effectively as a way to persuade or influence people
using any means necessary to force someone to change their perspective

the art or skill of speaking or writing formally and effectively as a way to persuade or influence people. It involves using language effectively to appeal to emotions, logic, or credibility in order to sway an audience's opinion or behavior.