If you enjoy picking on others you are considered a bully. Being a bully is not a good thing.
If you are being bullied...
If you are being bullied tell an adult or someone you trust. Don't go after the bully yourself. If you do, you might be considered the bully. You might not want to tell an adult or teacher because you are afraid that is what the bully wants, but it is the right thing to do.
Ways to Tell if you are a Bully
You can tell if you are a bully. Do you like to tease kids younger than you? Do you enjoy picking on others? Do you degrade others? If you do any of those then you can be considered a bully.
What to do if you are Considered a Bully
If you are currently bullying others please stop. Some of the best ways to do that is to say sorry. It might not seem right, but it is.
If you are being bullied online go to my tackk on cyber bullying. It doesn't have that much different info.