A casino or gambling establishment is a building or room where people can play games of chance for money. Some casinos specialize in particular types of games, such as poker, blackjack, and roulette, while others offer a wide variety of games. In the United States, casinos are usually located in towns and cities and are often combined with hotels, restaurants, retail shops, and entertainment venues. In addition, some American Indian reservations have casinos.

The casino offers a mathematical expectation of winning to its patrons, known as the house edge, but there are also games where skill can eliminate the house advantage, such as baccarat and chemin de fer (known as trente et quarante in France). These are usually referred to simply as table games. The casino makes its profit by taking a percentage of each bet, known as the vigorish, or charging an hourly rate for table games like poker.

In modern times, a casino is generally patrolled by a physical security force and monitored by a specialized surveillance department. This team works together to quickly respond to calls for help and reports of suspicious or definite criminal activity. This type of casino security has been successful in reducing crime inside the casino and has helped to make casinos one of the safest places for gambling in the world.