Influence is the capacity to change another person's beliefs, attitudes, emotions, or behaviors through legitimate means — information, demonstration, authentic relationship, reasoned argument, narrative, and the psychological principles of reciprocity, consistency, social proof, authority, liking, and scarcity — as distinct from manipulation, which exploits psychological vulnerabilities to produce behavior change that bypasses informed consent and serves the influencer at the influenced person's expense.
Role
Influence literacy is simultaneously a productive competency and a defensive one: the person who understands the principles of influence can deploy them ethically to advance genuinely good ideas, earn deserved cooperation, and lead effectively — and can simultaneously recognize when they are being manipulated through the same principles by advertising, political messaging, social media, high-pressure sales, and interpersonal coercion. Most people are undefended against systematic influence attempts because they have never studied the principles being applied to them — experiencing the resulting attitude and behavior changes as freely chosen conclusions rather than as the predictable output of well-understood psychological levers.