Originally Posted by thunder1276
what do they do that helps you improve your game? dont they just keep track of all your winnings?
No, that's hardly a drop in the bucket. They keep track of all of your stats, and the stats of those you play against. By analyzing your stats and running various reports against your hand history, leaks become apparent and give you something to work on. They also provide a HUD for real-time opponent stats while you're playing.