If you have claimed a casino bonus with wagering requirements, you will have to wager a certain amount before you can withdraw money.
Most of the time, different games will contribute different amounts to the wagering requirements.
Slots may contribute 100%, for example, while for table games this contribution may only be 10%.
If you place a $10 bet on Slots, this translates into $10 contributed to the wagering requirement, but if you place $10 bets on a table game, only $1 will contribute.
Please note that some games, such as those with Live Dealer, may not contribute anything at all.