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 net casinos or virtual casinos, these are being established on an increasing rate over the past number of years. Online casinos make use of 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 casinos either rent or purchase the software from companies such as Realtime Gaming, CryptoLogic Inc, Playtech, Microgaming and International Game Technology.

There are mainly two kinds of online casinos classified on the basis of the interfaces they normally use - downloadable casinos and web based casinos and some casinos offer both these types. A couple of online casinos offer live gaming options additionally, where the trusted lottery dealer will be within the studio and players can communicate with the dealer real time.