The wagering requirement (also called playthrough or rollover) is the most critical part of any bonus. It is a multiplier that represents how much total money you must bet before bonus funds can be withdrawn as cash.
Operators implement these requirements to prevent players from claiming a bonus and immediately withdrawing it without actually playing. Without wagering, bonuses would be unsustainable for the platform.
There are two main types of wagering: Bonus-only (where only the bonus amount is multiplied) and Deposit + Bonus (where both your deposit and the bonus are multiplied). The latter results in a higher total amount to wager, but often indicates a more generous initial offer.
You can track your progress in your account dashboard; the system automatically deducts the value of every bet from the remaining wagering total. The specific multiplier for any given offer is clearly displayed in the Promotions section.