A casino, also known as a gaming establishment or a gambling hall, is a place where people can play games of chance for money. Casinos are often built near or combined with hotels, restaurants, retail shops, and other tourist attractions. They can also be found on cruise ships and in some military installations.

Most casinos offer a wide range of games, from traditional table games like blackjack and roulette to modern video poker and slots. In some casinos, patrons can also bet on sports or events. The precise origin of gambling is unknown, but it has been a popular pastime throughout history in many different cultures.

In the United States, legal casinos are regulated by state and local laws. The largest concentration of casinos is in Nevada. Other major casino centers include Atlantic City, New Jersey and Chicago. In addition, some American Indian reservations have casinos. In other countries, casinos may be built on land or in riverboats.

In modern casinos, security is usually divided between a physical force and a specialized surveillance department. The former patrols the casino floor and responds to calls for assistance or reports of suspicious or definite criminal activity, while the latter operates the closed-circuit television system. Both departments work closely together to prevent crime and ensure the safety of guests.