A casino is a gambling establishment. In modern usage, the term is usually confined to places that offer a variety of different types of gambling, such as table games, poker, roulette, blackjack, craps, and slots. Casinos may also offer other forms of entertainment, such as concerts and shows. They may also contain shopping centers and hotel accommodations. Most of the largest casinos are located in Las Vegas, Nevada; Atlantic City, New Jersey; and Chicago. In addition, many American Indian reservations have casinos.

Unlike other forms of gambling, casinos require an element of social interaction between players and the employees who run them. This makes them susceptible to a number of security risks. Patrons may try to cheat or steal, either in collusion with other players or independently; to combat these problems, most casinos have elaborate security measures. These include a high-tech “eye in the sky” surveillance system that allows security staff to monitor every facet of the casino at once; chips with built-in microcircuitry that enable casinos to oversee wagering minute by minute; and electronic systems that regularly compare slot machine results to expected probabilities.

Despite these dangers, casinos remain popular with many people, and are often the subject of movies and television shows. The Bellagio, for example, is one of the most famous casinos in the world. It has starred in numerous movies and is a frequent destination for tourists visiting Sin City. However, casinos are not cheap; gamblers can expect to spend a significant amount of money while there.