A casino is a gambling establishment where people can play games of chance or skill, with the house taking a small percentage of winnings. Some casinos also offer food and drink. Casinos are most commonly found in the United States and Europe, but are increasingly being operated on Native American reservations. Some casinos are built to resemble historical buildings or scenery, while others are designed with modern architecture and features. A casino may contain multiple gaming rooms, and is staffed by dealers and other employees to run the games.

The largest casinos in the world are located in Las Vegas, Nevada, and Macau, China, and feature thousands of slot machines and table games, as well as opulent accommodations, Michelin-starred restaurants, and designer shops. They generate billions of dollars in revenue each year for the companies, investors, and casino owners who operate them. They may also be the site of high-profile entertainment events featuring top-billed musicians and celebrity guests. Due to the large amounts of money handled within a casino, both patrons and staff may be tempted to cheat or steal, either in collusion with each other or independently. To prevent this, most casinos employ security measures such as cameras and surveillance systems. Casinos are also regulated by government agencies to ensure fairness and integrity.