Bonuses usually come with wagering requirements, which means that you have to bet a certain amount of money before you can withdraw any winnings that you make with the bonus money. Wagering requirements can vary widely from one casino to another, so it's always important to do some research.
Casino Bonus Funds are not withdrawable until you reach the play-through amount completing the offer. Casino Bonus Funds are lost if the offer expires or you choose to forfeit the bonus.