The wagering requirement (also called playthrough or rollover) is the most important rule in any bonus offer. Mechanically, it is a multiplier that determines how much you must bet before bonus funds are unlocked and become withdrawable cash.
These requirements exist because bonuses represent a financial risk to the operator. Without them, a player could claim a bonus and immediately withdraw it. By requiring the funds to be wagered, the platform ensures the credits are used for gaming.
There are two main types of wagering: Bonus-Only, where only the bonus amount is multiplied, and Deposit + Bonus, where the total sum is multiplied. The latter results in a higher total amount to bet before completion. Progress is tracked in real-time within your account; as you place bets, the "remaining wagering" amount decreases. The specific multiplier for any given offer is always clearly displayed alongside the promotion in your account dashboard.