Many players mistake a casino bonus for "free money" that can be withdrawn immediately. In reality, bonuses are extra play credits designed to extend your gaming session and provide more opportunities to win. When you claim an offer, these credits are typically stored in a separate Bonus Balance, distinct from your Cash Balance.
The critical distinction is how these balances behave. Your cash balance consists of your own deposited funds, which can usually be withdrawn at any time (subject to general platform terms). Bonus funds, however, are subject to specific conditions. Most platforms utilize a system where your cash balance is used first; once that is exhausted, the system draws from your bonus balance. Bonus funds only become "real cash" after the associated requirements are fully met.