Online casinos are the internet version of the conventional casinos, which allow players to bet on games and win prizes online. Otherwise known as as the net casinos or virtual casinos, these are being established on an increasing rate over the past few years. Online casinos use a Random Number Generator (RNG), which provides a sequence of numbers in a random order, based on 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 actually mainly two kinds of lottery online casinos classified on the foundation of the interfaces they use - downloadable casinos and web based casinos and some casinos offer both these types. Several online casinos offer live gaming options in addition, where the dealer will be in the studio and players can connect to the dealer real time.