Online Casinos is helping the gambler to make an ideal gambling, but in online also many malpractices will happen. Many types of online casinos are there to entertain the gamblers. Online casinos are separated in to three important categories, the categories are web-based casinos, download based casino and the earlier invention is live casinos. This web-based casinos doesn’t require any software to download to use, we can play the game using the websites. We require some of interfacial factors like flash or java. A good bandwidth is required to play the game continuously without any interruption. Casino Deposits should be done in web-based casinos using any of the Casino Deposit Methods. Even though many Online Casinos are in practice the second category is widely used by most of the gamblers because it need not require any website support. Simply download the software; using that software we can play the game. Download based casinos should be quicker than the ordinary and web based casinos. The third one is similar to the download type casinos but the difference is players can speak or interact with the real gamblers or players. The disadvantage in the download type casino is there is a possibility of virus should attack the software, this is not in the case of web-based casinos.