Some casinos require their players to provide a deposit to be used to play with at the casino. This is quite similar to the practice that is involved with playing at a traditional casino in which you need to purchase tokens to use in the casino setting. Online, many casinos require you to pay a deposit at the casino which are the funds that you can use to play any of the games you would like at that casino.
Although it is harder to find than ever, some casinos are now offering no deposit requirements. Here, they do not require you to make a large deposit of funds in the casino when you are playing. Rather, the funds can be credited to your credit card or another payment option can be used. This is a good option, in most situations, since you do not have to put a lot of money into the casino to get started playing.