Bonuses offered by gambling operators can vary, but typical promotions grant players bonus funds or free spins to encourage them to use their platform. Bonuses are also designed to encourage players to continue betting using their own money when the bonus funds run out.
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.