According to psychologists, rage is an in-born behavior that every person exhibits in some form. Rage is often used to denote hostile/affective/reactive aggression (as distinct from predatory/instrumental/proactive aggression, which by contrast is motivated by a desire to obtain some goal by use of aggression).
It denotes aggression where there is anger present, that is motivated by causing some harm to others, and that is characterized by impulsive thinking and a lack of planning.
Some psychologists, however, such as Bushman and Anderson, argue that the hostile/predatory dichotomy that is commonly employed in psychology fails to define rage fully, since it is possible for anger to motivate aggression, provoking vengeful behavior, without incorporating the impulsive thinking that is characteristic of rage. They point to individuals or groups such as Seung-Hui Cho in the Virginia Tech massacre or Eric Harris and Dylan Klebold of the Columbine High School massacre, all of whom clearly experienced intense anger and hate, but whose planning (sometimes over periods of years), forethought, and lack of impulsive behavior is readily observable.