A casino, or gambling establishment, offers gamblers a variety of games of chance and ancillary services such as restaurants, hotels and entertainment. The casino business is global in scope, with many large cities hosting multiple casinos.

Slot machines are the most popular casino game and earn a greater proportion of a casino’s gross revenue than any other activity. They are simple, require no skill or strategy, and pay out according to a predetermined pattern that is determined by on-board computer chips. The machines used to use mechanical reels of varying colors but now the majority are electronic and display a series of rotating bands of colored shapes.

Most casinos also offer table games such as blackjack, poker and baccarat. Some even feature Far Eastern games such as sic bo, fan-tan and pai gow. In addition, some casinos may also feature other games that are particular to their locale or culture, such as two-up in Australia, keno in the United States and Europe, and boule or trente et quarante in France.

Despite their reputation for being places of chance, casinos are highly profitable businesses. Every game offered gives the casino a mathematical expectancy of winning, and it is very rare for a casino to lose money on a single day’s operation. To ensure that this is the case, casinos invest a great deal of time, effort and money into security. This starts on the casino floor, where employees keep an eye on patrons to spot blatant cheating such as palming, marking or switching cards or dice. In addition, elaborate surveillance systems allow security workers to monitor the entire casino floor at once from a control room filled with banks of security monitors.