A casino is a gambling establishment where people can wager money on games of chance or skill. Modern casinos offer a wide range of gambling products, from traditional table games to electronic gaming machines. Some casinos also feature entertainment options such as stage shows and dining. A casino can be located in a large building or it may be an independent operation in another venue. In the United States, a casino is typically licensed by state regulators.

A modern casino usually has several security departments to protect the property and patrons. These include a physical security force and a specialized surveillance department. Security personnel patrol the casino floor and investigate reports of suspicious or criminal activity. They also use cameras to monitor the gaming floor and the patrons. Table games are monitored by pit bosses and table managers, who are trained to spot blatant cheating, such as palming or marking cards. The casino also employs mathematicians and computer programmers to calculate the house edge for each game and develop strategies to maximize profits.

The casino industry is booming, with more states legalizing gambling operations and more countries building casinos to attract tourists. However, critics say that casinos have negative effects on the economy by diverting spending away from other forms of recreation and causing compulsive gambling. They also argue that casinos do not benefit local communities, especially small cities and towns. In 2024, New York City has one Las Vegas-style casino and is planning for more.