Online casinos allow players to gamble through the Internet as well as in the comfort of what ever place they can be in rather than traveling to wherever their favorite establishments are situated. They are also known as Internet casinos or virtual casinos because of this. Just like their tangible "brick and mortar" counterparts, online casinos have ratings in the type of payback percentages and odds. A number of them even publish payout percentages on their sites, vaunting higher payback and higher frequency than their competitors. Payback percentage is defined as "is the overall percentage that a machine will return to the player in the long run." This parameter is generally programmed into whatever game the virtual casino may very well be running and is set in line with the owner's specifications. As a result of its very nature of being virtual and intangible, online casinos have trust difficulties with prospective as well as 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 as outlined by how players communicate with each other. These are: Web-based bookie lottery online casinos - these kinds of virtual casinos don't require downloading files; they readily play by way of a wide range of Internet browsers. Many 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 - Engaged in this type of casino involves downloading a client installer needed for players to access the virtual site. The benefit from this sort of casino is the fact that it generally runs considerably faster than Web-based ones. The disadvantage is that interested players need to download the client as well as the risk of installing malware from shady parties is quite much real. Live-based casinos - In 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 life environment. Online casinos may offer any one or all of the following gambling pastimes: online poker, roulette, blackjack, baccarat, craps and online slot games.