A casino bonus is an incentive offered by online casinos to attract new players and retain existing ones. These bonuses can come in various forms, such as welcome bonuses, free spins, or cashback offers. Typically, they enhance a player's bankroll, allowing for more gameplay and increased chances of winning. However, it's essential to read the terms and conditions, as bonuses often come with wagering requirements and restrictions. By understanding these factors, players can maximize their gaming experience and make the most of the bonuses available.