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Unreliable citations may be challenged or deleted. This article needs additional citations for verification. Online casinos generally offer odds and payback percentages that are a bit higher than land-based casinos. Some online casinos claim higher payback percentages for slot machine games, and some publish payout percentage audits on their websites.
Online casinos can be divided into two groups based on their interface: web-based and download-only casinos. Download-based online casinos require the download of the software client in order to play and wager on the casino games offered. The online casino software connects to the casino service provider and handles contact without browser support. Download-based online casinos generally run faster than web-based online casinos since the graphics and sound programs are cached by the software client, rather than having to be loaded from the Internet. This determines the order of the cards in card games, the outcome of a dice throw, or the results produced by the spinning of a slot machine or roulette wheel. When implemented correctly, a PRNG algorithm such as the Mersenne Twister will ensure that the games are both fair and unpredictable. However, usually the player has to trust that the software has not been rigged to increase the house edge, as its inner workings are invisible to the user.
In a live casino game, a human dealer runs the game in real time from a casino gaming table, which can be seen via a live streaming video link. Players can make betting decisions via a console on their computer screen, and can communicate with the dealer using a text chat function. These games are a lot more expensive for websites to host than virtual games, as they involve a heavier investment in technology and staffing. The configuration of these rooms varies from casino to casino, with some having several gaming tables in one room, and some having a single table in each room. The high running costs involved with operating live dealer games is the reason why online casinos only tend to offer a handful of the most popular games in this format, such as roulette, blackjack, sic bo, and baccarat.