Anti-bullying week starts on Monday 15 November in th UK.

By looking at this picture I think you understand what "bulling" is.

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, cyber-bullying, 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.

On this link a teenager explains : "I was a victim of cyber-bullying" and she writes what she did.

Celebs talk to Newsround about bullying on this one.

Finally here there is a "Guide to Bullying" and there a quizz.

Don't hesitate to send me your comments on that serious subject.