Bullying is repeated harmful behavior toward another person. It can be physical, such as hitting, or verbal, such as name-calling. Bullying can also happen online through messages or posts.

In schools, bullying may involve teasing, exclusion, or spreading rumors. It often includes a power imbalance, where one person has more control or influence. Many schools have rules and programs to address bullying.

Bullying is recognized in education systems and laws in many countries. It is studied in social and behavioral research.