Many players mistake a casino bonus for "free money" that can be withdrawn immediately. In reality, bonuses are extra play credits provided to extend your gaming experience. When you claim a bonus, these funds are stored in a separate Bonus Balance, distinct from your Cash Balance.
The fundamental difference is that while your cash balance can be withdrawn at any time (subject to general terms), the bonus balance is locked behind specific conditions. Typically, the system utilizes your real money balance first; once that is exhausted, it begins spending the bonus funds. Only after the bonus conditions are fully satisfied do the remaining funds convert into withdrawable cash.