A no deposit bonus in a casino is a promotional offer that allows players to try out 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 a chance to win real money while exploring the casino's offerings. It's an attractive option for newcomers, as it reduces the financial risk and encourages them to experience the thrill of online gambling. However, players should be aware of the terms and conditions, including wagering requirements, before claiming these bonuses.