A casino, also known as a gambling house or a gaming room, is a place where people can gamble and take part in other casino games. These establishments are most often located in resorts, hotels, or tourist attractions. In the United States, casinos are most often found in Atlantic City, New Jersey; Las Vegas; and other cities with large tourism industries. Some casinos are also located on American Indian reservations. In the latter half of the 20th century, many states legalized these facilities.

The majority of casino games involve chance and some degree of skill. The mathematically determined odds ensure that the casino has a net profit on most bets, except for those involving pure chance such as roulette and baccarat, for which the house edge is only about one percent. Slot machines and video poker are the economic backbone of modern casinos, generating significant revenue from relatively low bets, high turnover, and ability to adjust machines for desired profits.

Other major types of casino games include table games such as blackjack, baccarat, and roulette. They may be operated by live dealers or by machine, and they typically offer higher payouts than other games. In some cases, table games are also a part of poker tournaments that pit players against each other for prize money. Some casinos also operate horse racing tracks and other forms of sports betting. In addition to these activities, some casinos host concerts and other events.