Deposit bonuses are rewards you get when you add money to your online casino account. Usually, the casino will match a percentage of your deposit (like 100% up to $200) giving you extra funds to play with.
Example:
You deposit $50 and the casino offers a 100% bonus. It’s like they give you another $50 to play with, so you have $100 total. Just keep in mind there is usually a set of rules when it comes to deposit bonuses such as wagering requirements, maximum bet you can place, maximum cashout, etc.