Rakeback is something that you can sign-up for that will give you some of the rake that you pay to the site back. In most cases you have to create your account through the rakeback site to get it, but there are a few exceptions.

Rake Back, Rake is the fee's you pay to play poker, and Rake Back is exactly what it implies, you get a percentage of your rake fees returned to you.

I have rakeback and I get 27% of the rake I pay returned to me every Friday minus bonuses I was paid and some other restrictions.

You pay rake on hands in ring games if the pot becomes large enough and the extra fee you pay in SnG's and Tourney's is also rake ($2+.25 SnG for example, the .25 is the fee or the rake to play, the $2 goes to the prize pool).

Some places offer even better deals.  Before signing up at any poker room it is a good idea to find out if they offer rakeback and look into how getting it before you create an account.

You can get rakeback on an existing account if you are not signed up through an affiliate.  If you are already tied to an affiliate and not receiving rakeback you are SOL.  Do not attempt to open another account in order to get rakeback.

You can get rakeback on Full Tilt but not on PokerStars.  Those are the only two rooms I ever play at.  Other members can tell you about other rooms I imagine.

What sites do you play at?

RaketheRake is connected to most of them, and if you sign up through us, you get your Rake back AND we get 4% to help fund the fourum. Just click on the banner you find at the bottom of the following page:

http://www.sixandfourum.com/index.php/topic,353.0.html

and reply here/PM if you have any other questions.

Rakeback pros is the only site that I know where you can get rakeback after you sign-up and it's only for FullTilt.