A casino is a gambling establishment where patrons gamble by playing games of chance or skill, including poker, blackjack, roulette, craps, and video poker. Some casinos offer additional entertainment options such as concerts and sports betting. A casino may also serve food and drink. The precise origin of the word is uncertain, but it may be derived from the Latin caino, meaning a small house or enclosure. In modern usage, the term is almost always a reference to an actual gambling facility, rather than to a specific game.

In the United States, there are over 20 regulated casinos in operation, including one casino in New York City proper. In addition, there are many tribal casinos and a number of racinos, which feature racetracks and lottery gaming.

Casinos are often built near or combined with hotels, resorts, restaurants, retail shops, and other tourist attractions. They are known for their entertainment options, and some even host professional sporting events. In military and non-military use, the term may refer to a headquarters building or a unit of soldiers. Casinos are regulated by state and federal laws to ensure honesty, integrity, and security. This is done by using cameras and other technological measures, as well as rules of conduct and behavior. In addition, a casino must have an adequate number of employees to monitor the activity in the facility and ensure that it is fair to all players. Those with problems gambling can seek help through support resources, such as hotlines and self-exclusion programs.