A casino is a gambling establishment that features games of chance and is licensed to operate by a government authority. Casinos offer a wide variety of gambling-related entertainment to their visitors and are known for attracting large crowds of people. Often they feature restaurants, bars, and other facilities for visitors to relax in after a day of gambling. Some casinos even offer a variety of shows and other attractions.

Most casinos make money by betting on games of chance. Each game has a built in advantage for the casino; it may be just a few percent, but it adds up over the millions of bets that are placed. Casinos have used this revenue to build elaborate hotels, fountains and replicas of famous towers and pyramids. They also employ a lot of people to run their operations and provide amenities for gamblers.

Despite the many amenities, casinos would not exist without the games of chance. Slot machines, blackjack, roulette and other table games generate the billions of dollars in profits that casino owners rake in each year.

The games of chance are controlled by rules and procedures that help the casino maintain its edge. The routines of players follow certain patterns, making it easy for security personnel to spot a deviation from the norm. In addition to a high-tech eye in the sky, some casinos use other methods of surveillance, such as catwalks that allow surveillance staff to look down on the activities from above, and one-way mirrors that let them see into rooms where people are playing slot machines and tables.