In this chapter, students will explore the powerful influence of social factors on individual and group behavior. They will examine the principles of social cognition, including the formation of attitudes, stereotypes, and prejudices, as well as the dynamics of interpersonal relationships, group dynamics, and the impact of cultural and societal norms. The chapter will also cover topics such as prosocial behavior, aggression, and the application of social psychological principles in areas like marketing, law, and conflict resolution.