Bullying is defined as repeated and prolonged exposure to aggressive actions on the part of one or more people that are difficult to defend against.
There are a number of different types of bullying. For example, bullying may be verbal (being called bad names), social (being socially excluded), physically aggressive (getting hit or shoved by another person), or occur through the internet (referred to as cyber-bullying).
Bullying is associated with a number of negative consequences, including anxiety, depression, loss of sleep, and difficulties at school.

