What is handball?,what are the rules of the game?

You can put your search engine to work and find that out easily. It is a very fast paced sport!

hand ball is when you grab other peoples ball

Handball is a team sport where two teams of seven players each (six players and a goalkeeper) pass and bounce a ball trying to throw it in the goal of the opposing team.

http://en.wikipedia.org/wiki/Team_handball

get hit your out catch it hes out visa versa

Moving the ball down court, to a goal. You cant take steps, and you cant dribble. You can play defense.

There are two completely different types of handball, Gaelic and Team Handball, Team being more popular worldwide(and far more fun), and Gaelic being the more popular here in North America. You should be able to find out about all you need to know about both versions from their wikipedia articles here:
Gaelic: http://en.wikipedia.org/wiki/Gaelic_handball
Team: http://en.wikipedia.org/wiki/Team_handball