Online casinos are the internet version of the conventional casinos, which allow players to bet on games and win prizes online. Also called as the internet casinos or virtual casinos, they are being established upon an increasing rate over the past couple of years. Online casinos employ a Random Number Generator (RNG), which provides a sequence of numbers in a random order, based upon which the table games and blackjack are played. Most of the online gambling agency casinos either rent or purchase the software from companies such as Realtime Gaming, CryptoLogic Inc, Playtech, Microgaming and International Game Technology.

There are actually mainly two kinds of online casinos classified on the foundation of the interfaces they normally use - downloadable casinos and web based casinos and some casinos offer both these types. A number of online casinos offer live gaming options also, where the dealer will be within the studio and players can interact with the dealer real time.