Online Casinos are also known as virtual casinos or Internet casinos. The basic function of an online casino is to enable gamblers to play casino games through the Internet.  Online casinos are more or less similar to an offline casino. An offline casino is a land based casino, because you can physically walk into the casino. The only difference between an online and offline casino is that the former can be played from home, without physically moving to a destination.  Many online casino sites offer sign up bonuses to new players, which is some percentage of the player's deposit. The players can withdraw this amount only after they wager at least 25 times the total amount of the deposit plus the bonus. Wagers on baccarat, craps, roulette and sic do not count toward meeting wagering requirements.

Online Casinos are basically of three different types
1. Web-based online casinos: In web-based online casinos players do not have to download any software to their computer for playing casino games. You can directly play any casino game through your browser.
2. Download based online casinos: In download based online casinos players have to download the software to play casino games and also to wager the casino games offered. One of the features of download-based casinos is that it runs faster than a web based online casino, since the graphics and sounds program are located within the software itself.
3. Live based casinos: Live based casinos are real world casinos. In simple words live-based casinos allow the players to interact with each other and create a live environment. Live based casino gives player an opportunity to see, hear and interact with live dealers at tables in brick and mortar casinos worldwide.