A casino, or gambling house, is an establishment that offers various forms of gambling. It also includes facilities for other entertainment activities such as bars, restaurants and live music events. In the United States casinos are generally licensed and regulated by the state in which they are located. Casinos are also common in many international cities. In Europe, they became popular after the legalization of gambling in most countries in the late 20th century. They are often combined with hotels and other resort amenities, as well as retail shops and restaurants. In addition, they can be found on American Indian reservations, where they are exempt from state anti-gambling laws.

Modern casinos offer a wide variety of gaming options, from traditional table games such as blackjack and roulette to slots and video poker machines. Some casinos also feature luxurious accommodations and top-notch restaurants. However, the billions in profits generated by casinos each year largely come from gambling, and that is what draws in most people.

Security in a casino starts on the floor, where employees keep a close eye on patrons to spot blatant cheating techniques like palming or marking cards and dice. The dealers also follow a set routine, which helps them to spot any deviations from the norm. Higher-ups monitor the activities of these employees with a view to ensuring that security procedures are followed correctly.

Although casinos are a major source of entertainment, their impact on a community is debatable. Critics argue that the profits they generate drain money from other local businesses, and that the costs of treating problem gamblers offset any economic benefits that they may bring.