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, 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 mainly two kinds of online casinos classified on the basis of the interfaces they use – downloadable casinos and web based casinos and some casinos offer both these types. A few online casinos offer live gaming options also, where the dealer will be in the studio and players can interact with the dealer real time.Web Based CasinosWhile playing in these casinos you don’t need to download the gaming software. Your computer browser needs to support plug-ins such as Macromedia Flash and Macromedia Shockwave. HTML interface is also allowed by some online casinos.Downloadable Gaming ExperienceIn some kinds of online casinos, you need to download gaming software to play various casino games. These are faster than the web based casinos because the support plug-ins do not need to be downloaded, but are offered by the service provider. The software connects you to the service provider through which betting and playing happens. These are also superior in case of sound and graphics than the web based casinos.Types of Online Casino GamesMost of the these casinos offer commonly played gamed like baccarat, craps, poker, blackjack, slot games, keno, roulette and bingo. For paying these games, you can put money through various deposit options.Attractive PromotionsMost of the these casinos to attract new players offer many promotional offers and deals (casino bonus) on signing up and while depositing the initial amount. Almost all casinos promote casino bonus offers on a big way. Some bonus can be cashed out while some others can only be used while playing. Some of the casinos offer points instead of money, which increase after every online game you win. Comp points are also one of the popular ways of offering bonuses to online players, which can be cashed out as prize, money or com points itself. Wagering amount and points vary with each game you select to play. While some casinos offer attractive promotions on every game, some others might restrict the bonus offers to certain games. They accept many deposit options too.