An online no deposit casino bonus is a promotional offer that allows players to try out a casino's games without having to make an initial deposit. This type of bonus typically comes in the form of free spins or bonus cash, giving players the chance to win real money while exploring the casino's offerings. No deposit bonuses are popular among new players, as they provide a risk-free way to experience the excitement of online gambling. However, it's essential to read the terms and conditions, as wagering requirements and game restrictions may apply.