A casino is a place where people can gamble and play games of chance. In modern usage, the word is most often used to refer to a large, lavish facility with multiple gambling operations and entertainment options. The term can also apply to smaller, less-opulent establishments.

In addition to gambling, casinos often host stage shows, restaurants, bars, and other forms of entertainment. They may be integrated into resorts and other larger facilities, such as hotels; or they may stand alone. Casinos are located in cities throughout the world, and they may also be found on ships and in other locations where people can legally gamble, such as Indian reservations.

Casinos make billions of dollars each year for their owners, investors, and employees. In the United States, they are often regulated by state and local governments. In some cases, they are even owned by Native American tribes.

Gambling at a casino is done through table games, such as blackjack and roulette, or through slot machines. Some of these games involve skill, such as poker, but most of them rely primarily on luck. In the modern sense of the word, a casino also has gaming tables for non-table game activities, such as sports betting.

To encourage patrons to gamble, casinos create an environment that is designed around noise, light, and excitement. They often have brightly colored floors and walls that are meant to stimulate and cheer the players, and they try to minimize their awareness of the passage of time by removing clocks from the premises. They may also offer free drinks and other inducements, especially to high rollers.