A casino (plural: casinos) is a facility that offers the opportunity to gamble. Most casinos are equipped with gaming tables and machines where patrons can place bets on games of chance, such as roulette, craps, baccarat, blackjack, and video poker. Some casinos also offer skill-based casino games, such as poker and keno. Skilled players can reduce the house edge by using strategy or card counting.

In addition to offering gambling opportunities, many casinos have restaurants, bars, and shows. Some are famous, such as the Monte Carlo Casino in Monaco, whose reputation has made it a popular tourist destination. Others are located in cities that are known for their nightlife, such as Las Vegas.

Modern casinos are governed by strict rules regarding security. In addition to a physical security force, most have a specialized department that monitors closed-circuit television and other electronic surveillance systems. Security personnel are trained to spot anomalies in betting patterns that may indicate collusion or cheating.

Casinos are operated by a variety of private and public organizations. Some are owned and operated by states or local governments, while others are owned and operated by Native American tribes. The largest casino in the world is Foxwoods Resort Casino in Ledyard, Connecticut, owned by the Mashantucket Pequot Tribe. It has 4.7 million square feet of floor space and features more than 7,000 slot machines, table games, and bingo halls. The Grand Lisboa in Macau is another large casino.