CAA: Christian Anime Alliance

Yeah, I did not know where to put this, since there didn't seem to be any real place in the RPG forums to ask this question, and y'all are probaly goin to jump on me and beat me to a pulp for not knowing this, but, here it is:

What is an RPG, how is it played, and how do I join one, if I don't have that much time to play?

The only thing I know about them is that you have a character, and there are other people with characters and they all go on adventures, or something like that, in a thread.

That's pretty much it! And yes, you have to have a lot of time, so it might not be a good idea if you don't. Time is the main reason I don't do it.