Aggression is any form of behavior by one person which is intended to cause pain, suffering, or damage to another person. Aggression includes many types of behaviors. Although most people usually only think of aggression in terms of physical attacks, verbal behavior meant to cause psychological harm is also aggression. Physical aggression includes behaviors like hitting another person or firing a gun. Verbal aggression includes behaviors like screaming at someone in anger or using an obscene gesture. Aggression is part of most societies but it is less controlled in the United States than in many other countries. Aggression is difficult to predict, and often hard to control.

Anger and aggression often, but not always, go hand in hand. Anger is a normal, and necessary, human emotion. It is how people naturally respond to threats, and it inspires powerful, often aggressive feelings that allow people to fight when they...