A cashback bonus is a reward given by an online casino to help players recover some of their losses. In most cases these bonuses are given as a percentage of the player's total losses, based on a predefined time period, game type, or overall sums lost. Cashback bonuses are typically a fixed amount, meaning there is no risk of ending up out of pocket due to high wagers. The exact terms and conditions of the cashback bonus will depend on the individual casino but the general principle is the same across all sites.