Persuasion is really about changing someone's perception. You're trying to alter their beliefs and behavior. Persuasion is really about moving someone from point A to point B.
Manipulation implies coercion. When we're talking about persuasion, there's more of a win-win: both parties are happy. Manipulation implies that only one party is satisfied.
So it's the approach that's different?
Manipulation is often synonymous with some kind of threat: If you don't do this, this will happen. Persuasion is more a meeting of the minds: You're getting someone to come around to your point of view. No one gets hurt. You changed a person's perception, but not by coercion or threat.
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