A casino is a facility for certain types of gambling. It may also contain entertainment features such as stage shows and live music. Some casinos are combined with hotels, resorts, restaurants, retail shops, and cruise ships. A casino may also offer sports betting and horse racing.

Gambling in some form almost certainly predates recorded history, with primitive protodice and carved six-sided dice found at archaeological sites. However, the casino as an organized place for gamblers to find a variety of games under one roof did not develop until the 16th century during a gambling craze that swept Europe. In the early 17th century, noblemen in Italy would hold private parties at places called ridotti to enjoy the excitement of gambling with friends and fellow members of their social class.

Casinos often have high security measures in place. They are staffed with employees who ensure that the rules of each game are followed, and patrons do not cheat or steal from other players or staff. Various technologies are used to prevent this, including cameras that monitor the entire casino floor and a separate room filled with banks of security monitors. In addition, some casinos employ “chip tracking” systems that allow staff to watch the exact amount of money placed at each table minute by minute, and to detect any statistical deviation from expected results; and roulette wheels are monitored electronically.

The United States has the largest concentration of land-based casinos in the world. These are located in Las Vegas, Nevada; Atlantic City, New Jersey; and Chicago. There are also several Indian-owned casinos throughout the country. In some cases, tribes have partnered with casinos to expand their gaming operations.