A casino, also called a gambling establishment or a gaming hall, is a place where people can gamble on games of chance. These games may be played for cash or on machines that simulate gambling. Casino games are popular in some countries and legal in others. Casinos are often located in luxurious hotels or on waterfront properties and entice visitors with elaborate architecture, lavish interior decor, and high-profile entertainment.

Gambling in some form or another has been a part of human civilization for millennia. Evidence of gambling can be found in China (2300 BC), the ancient Greeks (500 BC), and Roman civilization (4th century AD). The earliest American casino was a private club called the El Cortez, which opened in 1931. In the United States, casino gambling was largely illegal until Nevada passed legislation in 1949 to allow it. The popularity of casinos grew quickly in other parts of the world, and it was not long before they began to appear in places such as London and New Orleans.

Although most gambling is done in the spirit of fun, it can be addictive and lead to serious problems. To reduce the risk of gambling addiction, some jurisdictions regulate the type of games offered and how much money is won or lost. Some states have even banned some forms of gambling entirely. Those who are addicted can receive help through counseling and other treatment programs. Many casinos also offer incentives to keep patrons gambling, such as free meals and show tickets.