The Instinct Theory proposes that aggression is innate human behavior that evolved through natural selection. It views aggression as an inevitable instinct, like in animals. There are two perspectives: the psychoanalytical approach sees aggression as a destructive drive that builds up and must be directed outward, while the ethological approach sees aggression building up to create a drive that must be released constructively to achieve catharsis. However, the Instinct Theory has been criticized for oversimplifying human behavior and failing to account for social and cultural influences that can override innate factors.