Aggression is behavior, verbal or physical, intended to physically hurt or harm in some other way another person or thing. Two important definitions of aggression are as follows :

1. a) According to Dollard et al., aggression can be defined as “a behaviour whose goal is the injury of the person towards whom it is directed”. Supposedly this includes physical and verbal aggression.
2. b) Baron and Bryne has defined aggression in the following words “aggression is any form of behaviour directed towards the goal of harming or injuring another living being who is motivated to avoid such treatment”.
   The term "aggression" refers to any activity that is intentionally intended to cause another person bodily pain, mental anguish, or physical damage or distraction. The desire that drives a person to behave in an aggressive manner is an essential component of aggressive conduct. There are many different kinds of aggressive actions, and not all of them cause damage. For instance, a physician who administers an injection that causes injury to patients but did so with the intention of halting the progression of a disease is not judged to have engaged in an aggressive conduct since the injection was intended to serve as a preventative measure. Aggression may take the form of either direct or indirect behaviour, either active or passive behaviour, and either physical or verbal behaviour.

Perspectives on Aggression :
The meaning of the word "perspective" is "point of view." Different points of view on aggressiveness, often known as theories of aggression, are referred to as "perspectives on aggression." It explores the perspectives of several researchers on the factors that may contribute to why human beings engage in aggressive behaviour against one another. There are a great number of distinct points of view about aggressiveness. The following are the three views that are the most common: