This document summarizes key concepts from social psychology. It discusses how first impressions are formed based on a person's appearance, actions, and other factors. It provides examples of both positive and negative first impressions. It also discusses stereotypes based on gender, ethnicity and occupation and how prejudices can form from these stereotypes. The document defines prosocial behavior, aggression, and negative attributional style, providing examples of each. It examines how these concepts relate to relationship satisfaction and conflict between people.