Free spins are a type of bonus where a player is granted a specific number of rounds on a slot machine at no cost while still having the chance to win real prizes. This promotional tool is widely used by online casinos to introduce players to new slot titles or to reward loyal customers for their continued activity on the platform. While the spins themselves are free, the resulting winnings are often credited as bonus balance rather than immediate cash, meaning they are typically subject to wagering requirements and specific game restrictions as outlined in the bonus terms. Players must often complete a rollover within a set timeframe to convert these winnings into withdrawable funds. Additionally, free spins may be capped at a maximum winning amount, but they remain one of the most popular incentives because they provide a risk-free opportunity to explore high-quality games and potentially boost a bankroll.