Online casinos allow players to gamble through the Internet and in the comfort of whatever place they are in rather than traveling to wherever their favorite establishments happen to be. They're better known as Internet casinos or virtual casinos due to this.

Much like their tangible "brick and mortar" counterparts, online casinos have ratings in the type of payback percentages and odds. Some of them even publish payout percentages on their sites, vaunting higher payback and better frequency than their competitors.

Payback percentage is defined as "is the overall percentage that a machine will return to the player within the long run." This parameter can be programmed into whatever game the virtual casino may be running and is set according to the owner's specifications.

As a result of its very nature of being virtual and intangible, online casinos have trust issues with prospective and even regular clients. In light of this many casino owners have purchased and/or leased proprietary software created by reputable software entities like CryptoLogic Inc, Realtime Gaming, Microgaming, and Playtech. They then peg their online casino's trustworthiness with the programming companies' reputations as well as the stability of their random number generators.

Online casinos are classified into three types in accordance with how players communicate with each other. They are:

Web-based online slots gambling (read the article) casinos - these types of virtual casinos don't require downloading files; they readily play through a wide variety of Internet browsers. A lot of them require Flash or Java for a player to participate in games however. The benefit of this sort of casino is the fact that sound clips and graphics needed for the game is streamed directly to the client over the Net. This dispenses the need to download relatively huge files.

Download-based online casinos - Participating in this sort of casino involves downloading a client installer needed for players to access the virtual site. The advantage of this sort of casino is that it generally runs faster than Web-based ones. The disadvantage is the fact that interested players need to download the client and also the risk of installing malware from shady parties is quite much real.

Live-based casinos - Inside this kind of casino, players can hear, see, and connect to other players. The internet will be relatively an unobtrusive medium of communication as players participate in a real world environment.

Online casinos may offer any one or all the following gambling pastimes: online poker, roulette, blackjack, baccarat, craps and online slot games.