Influence principles are psychological strategies that affect how people make decisions and behave. These principles, identified by social psychologist Robert Cialdini, include concepts like reciprocity, commitment, social proof, authority, liking, and scarcity. Each principle leverages human tendencies to encourage compliance or persuasion in various situations. For example, the principle of reciprocity suggests that people feel obligated to return favors, while social proof indicates that individuals often look to others for guidance in uncertain situations. Understanding these principles can enhance communication and improve interpersonal relationships in both personal and professional contexts.