This document discusses aggression, including its definition, forms, purposes, and causes. It examines factors that can influence aggression such as lower IQs, isolation, losing one's temper, and expression of violent behavior. Theories of aggression are presented, including social learning theory where aggression can be learned through observation or parenting, and instinct theory where aggression is inherited and stems from biological instincts. Physical and emotional reactions to experiencing aggression are also outlined.