A casino is a gambling establishment where people play games of chance or skill for money. It is a form of legalized gambling and has become one of the most popular forms of entertainment worldwide. Many governments regulate casinos to prevent gambling addiction and other criminal activity associated with it. Casinos are also a major source of revenue for some cities and states.

In addition to slots and table games, some casinos have hotels, restaurants, non-gambling game rooms, bars, swimming pools and spas. Some are enormous, with impressive decor and a mind-blowing number of games. As disposable income rises worldwide, and travel becomes more mainstream, casinos are expanding their offerings to attract more customers.

Gambling is a form of entertainment and has been popular throughout history in all societies. While the precise origin is unknown, evidence of gambling exists in ancient Mesopotamia, Greece and Rome. In modern times, it is found in almost every country and culture around the world.

In the United States, there are over 900 casinos and gaming facilities, most of which are located in Nevada and Atlantic City. Most casinos are owned by corporations or hotel chains, and some are operated by Native American tribes. Due to the large amounts of money handled within a casino, both patrons and staff may be tempted to cheat or steal. This is why casinos have extensive security measures to deter such behavior. These include cameras, guards and rules of conduct. In addition, the routines and patterns of casino games, such as how a dealer shuffles cards or deals them, are observed by security personnel to spot possible tampering.