A casino is an establishment for certain types of gambling. Casinos are often built near or combined with hotels, resorts, restaurants, retail shops, cruise ships and other tourist attractions. They may also feature live entertainment such as concerts and sports events. The precise origin of gambling is unknown, but it is widely believed to have existed in some form throughout history. Modern casinos are typically large, lavishly decorated buildings that offer a wide variety of games of chance. They are designed to appeal to the eye and provide a memorable experience for those who visit.

In the United States, casinos are generally considered to be legal only in those cities or areas that have been specifically designated as gaming zones by the state government. Historically, the majority of American states have had antigambling laws, but in the 1980s and ’90s many began to change them or allow casinos on American Indian reservations.

Some of the largest and most famous casinos in the world are located in Las Vegas, but there are also a number of them around the world, including some that are more modest in size and decor but still offer a wide variety of games to choose from. Some even have hotels, restaurants, non-gambling game rooms and other amenities to make them more attractive to families. Elaborate security systems are in place to deter crime and cheating, and casino patrons follow a set of patterns that can make it easier for security personnel to spot suspicious behavior.