A cashback bonus is a reward system offered by online casinos to provide customers with extra funds or a discount on their gameplay. Usually, when a player makes a deposit or wagers on a certain game, they will receive a percentage back as a cashback bonus. Generally, the percentage ranges from 5% to 30% of the amount wagered, depending on the casino. Cashback bonuses are used to incentivize customers to play more, as they are rewarded for their losses. Typically, the bonus is offered in the form of credits or free spins.