Sea Foam Trick

I have heard about this Sea Foam trick, but I have no idea what Sea Foam is or the procedure for using it. From what little I have heard, I assume it is used to clean the fuel system. Will someone enlighten me? Thanks.

I think it's a product to clean the carbon out of the engine. Look here:

http://forums.vwvortex.com/zerothread?id=3272343&postid=39195134