In tournaments you'll receive chips to play with. In a freezeout tournament, when you've run out of chips, you are out. Rebuy and re-entry tournaments are becoming more popular. They allow you to re-enter or rebuy your place (with real money) back in if you run out of chips. Cash games allow you to sit down with a minimum or maximum amount, and you can leave the game whenever you like . The blinds remain constant throughout.