Cialdini's Principles of Influence are six key strategies that explain how people can be persuaded. These principles include reciprocity, where people feel obliged to return favors; commitment and consistency, which suggests that once someone commits to something, they are more likely to follow through; and social proof, where individuals look to others for guidance in uncertain situations. The remaining principles are authority, which highlights the influence of credible experts; liking, where people are more easily persuaded by those they like; and scarcity, which emphasizes that limited availability increases desirability. Together, these principles provide insights into effective persuasion techniques.