Online casino, also called Internet gaming websites and virtual casinos, are actually online counterparts of traditional, land-based gaming establishments. Online casinos allow users to play online casino games via the Internet. Many online casinos boast odds and payback percentages that are higher than the ones offered in the traditional ones. If an online casino is using an appropriately programmed random number generator, table games, such as blackjack, have a predetermined house edge.

Online casinos' reliability and trustworthiness is oftentimes questioned. Many online gaming destinations obtain their play software from industry-leading software developers, such as Microgaming, Playtech and Cryptologic, so as to add an extra layer of credibility to their operations. These gaming software companies normally use random number generators to make sure that the numbers, cards or dice show up in a strictly random order.

Some online gaming websites feature multiple interfaces.

In order to play in download-based virtual casinos, players must first download the software. The online casino software makes contact with the casino software provider without involving the browser. Download-based online casinos usually run more rapidly than web-based online casinos because the graphics and sound programs are already located within the software. Nevertheless, there are also certain downsides to this type of online casinos. Users must consider that the initial installation of a download-based online casino takes time and that the program may contain malware.

Live-based casinos are essentially different from the two first kinds of online casinos. Latest technological developments now enable brick and mortar casinos all over the world to open a real-time window via the web for players to game tables in an interactive, live environment. Via these windows users can hear, see and even talk to live dealers.

The majority of virtual casinos offer registration bonuses to new players who make their first deposit. These sign up bonuses usually constitute a certain percentage of the player's deposit and practically all online casino registration bonuses require a minimum amount of wagering before players are allowed to cash out. In addition, some online casinos exclude certain casino games from the wagering requirement calculation.

Some online casinos have already proved to practice fraudulent behavior. The most common such examples are of casinos that refuse to pay withdrawals or using cheating software. The online casino community calls such web gaming destinations "rogues". A "rogue" casino may deliberately delay a withdrawal hoping that the player will continue wagering and lose the money all back.

Cheating software is apparently more seldom than payout predicaments. Although some online casinos have already been caught cheating by running non-random gaming software, most speculations regarding all sorts of casino cheating methods are usually the result of a player locating a pattern in a statistically small set of results. Many online gaming industry insiders claim that prominent online casino software development companies deliver the same odds and paybacks as their brick and mortar casino counterparts.

Shady online casino players usually display several patterns of behavior. For example, some fraudulent players register for several casino accounts using fake identities so they can claim a bonus multiple times. Nevertheless, online casino operators are aware of this highly common phenomenon and typically inactivate a player's account when they suspect he is tricking them. It is also widely believed that virtual casinos share fraudulent player blacklists.

The online casino operation issue is currently unclear in the U.S. While Federal Appeals Courts has ruled that the Federal Wire Act prohibits electronic transmission of information for sports betting within the U.S. borders, it also affirmed a lower court ruling that the Wire Act language does not bluntly prohibit online gambling on games of chance. In 1998, online gaming supporters tried to legalize the operation of Internet casinos across the United States. Online casino legalization act even passed in the Senate, but was later curbed by the House of Representatives. In July 2006, the House of Representatives passed legislation that is likely to cripple online gambling transactions. The legislation prohibits all online gaming companies from knowingly accepting money from U.S. gamblers. However, the bill still needs to be approved by the Senate to become law.