What is bullying?
Bullying often starts when people pick on something about you that's different.
It could be how big you are, the colour of your skin, or how you're doing at school.
But no one's the same - and that's why bullying is so stupid.
Also, there's cyberbullying, which describes forms of bullying using electronic devices such as mobile phones and computers, is becoming more common with the increasing use of modern technology.