A casino is an establishment where people can gamble. Casinos can also be used for other types of entertainment such as concerts and sporting events. Most casinos feature multiple gaming tables and a variety of slot machines. Some casinos have a hotel attached, and many feature restaurants and bars as well.

Casinos are heavily guarded to prevent cheating and stealing, either by patrons or casino employees. Because large amounts of money are handled, casino security is a high priority. Casinos have a variety of methods for this, including security cameras and a trained staff.

Most casino games have a built-in mathematical advantage for the house, known as an edge. This advantage is a small percentage of the total amount wagered, and it allows the casino to make a profit over time. This income is known as the vig or the rake, and it allows casinos to afford extravagant inducements to big bettors.

In the United States, most casino profits come from slot machines and video poker, which require no human interaction and can be programmed for any desired return on investment. Craps, blackjack and roulette are major moneymakers for American casinos as well, although their edges are usually less than two percent.

In the past, casinos were often financed by organized crime figures. Mobster money helped build the casinos of Las Vegas and Reno, and mafia members were known to take sole or partial ownership of some. In some cases, they even influenced game outcomes by threatening to kill or otherwise harm casino personnel.