When you play for real money, you are limited with the amount of your deposit. That’s fair, but somewhat distressing. Understanding this, casinos offer to players many cool opportunities to bet more than they currently can afford. This is called bonuses. Welcome bonuses are the most popular among them. The idea is you make a deposit and the casino immediately adds 100-200% of your deposit for free. Now you can play much longer! Note, that welcome bonuses are usually provided to new players only, but not always.