An online casino bonus is a promotional offer provided by online gambling platforms to attract and retain players. These bonuses can come in various forms such as welcome bonuses, free spins, or cashback offers. They allow players to try out games with additional funds or play risk-free. Understanding the terms and conditions associated with each bonus is essential as it influences how and when winnings can be withdrawn. Overall, online casino bonuses enhance the gaming experience by providing extra value for players engaging in their favorite casino games.