I have some questions about Steam.

[Litvyak]

1.Is it free?
2.Do you have to install it?
3.What do you do in it?(Besides play games)

1.) Yes, it is free. But you need to purchase atleast one game in order to be able to add people/chat with others.

2.) Yes, you have to install it.

3.) You can chat with others, make groups, and make friends.

If you were to purchase a game, I'd recommend you buy Half-Life 2, or some other source game, like Counter-Strike: Source or Team Fortress 2.