Bullying is a form of aggressive behavior, which may manifest as abusive treatment, the use of force or coercion to affect others  particularly when habitual and involving an imbalance of power.
 It may involve verbal harassment, physical assault .
The "imbalance of power" may be social power and/or physical power. The victim of bullying is sometimes referred to as a "target."

Bullying consists of three basic types-

Verbal-Calling names , insulting, teasing
Physical- pushing, knocking, on the head, kicking, hitting.
Relationship:- Although seen more often among girls, boys are also prone to this sort of bullying . It happens when one person among a group of friends is suddenly alienated by the rest.

Bullying can cause emotional trauma and scar the targeted child for life.