Aggression is a large category of such events. It basically contains acts done by people with the intention to hurt someone. Aggression can happen between individuals, groups, peoples or nations. It is usually directed towards persons but can also be directed towards someone's property.

In this large category we find more specific forms of aggression like violence. Violence means aggression performed with an instrument (a weapon, or using the body as a weapon like with biting, hitting kicking etc). The injury from violence is physical.