Bullying is a form of aggressive control of others that is repetitive. A bully uses threats, intimidation, and abuse toward those around him/her, including family and friends. Generally, the bullying is done because of anger or self-image issues and the bully’s rationale for the behavior is based on differences such as gender, race, sexual orientation, appearance, social class, and religion (among others).
When a group does bullying it is called mobbing. A bully may use tactics such as harassment, physical assault, and coercion to gain supremacy over another person (generally, a specific target/victim).