A free spin bonus is a popular promotion offered by online casinos to attract players. It allows players to spin the reels of a slot game without using their own money. This bonus gives players the chance to win real money prizes without any risk. Free spin bonuses often have specific terms and conditions attached, such as wagering requirements and maximum win limits. Players should always read the terms carefully before claiming a free spin bonus to understand how it works. Overall, free spin bonuses can be a fun and rewarding way to enjoy online casino games.