A casino is a building or room where gambling games are played. It may also refer to a collection of such buildings or rooms. In the United States, legal casinos began appearing in the second half of the 20th century, with most located in Nevada (Las Vegas). The Casino at Monte-Carlo is perhaps the best known casino in the world. Casinos can also be found in the Caribbean, on American Indian reservations, and in some European cities.

Gambling, which is usually based on chance and some element of skill, has been a part of human civilization for millennia. The first evidence of dice-based gambling dates to 2300 BC in China. Later, in Europe, the earliest casino was established in Monte Carlo in 1863. Modern casinos feature a variety of table and card games such as chemin de fer, baccarat, blackjack, and trente-et-quarante. They offer an array of slot machines and video poker games, as well as keno and other lottery-style games.

Many casinos feature elaborate and entertaining live entertainment acts. In addition, some have special lounges or bars where visitors can sip drinks and cigars while watching their favorite sports teams compete. In addition, many of the larger casinos around the world boast spectacular hotels and restaurants. For example, the palatial Caesars Palace in Las Vegas features an incredible array of culinary and entertainment options, from the Cirque du Soleil to the acclaimed Restaurante XO.