A casino is a gambling establishment that offers chances for gamblers to win money or prizes. Casinos offer a variety of games that are played with either cash or casino chips. Guests can also enjoy a range of other amenities such as restaurants, bars and entertainment.

Casinos are most commonly found in Las Vegas and Atlantic City, but they have become increasingly popular in other cities and states as well. Many American Indian reservations have casinos, which are not subject to state antigambling laws. Several states have legalized casinos on riverboats, as well.

There are three general categories of casino games: gaming machines, table games, and random number games. Gaming machines, such as slots and pachinko, allow patrons to bet on multiple outcomes of a single event, without the involvement of any casino employees. Table games, such as blackjack and craps, involve one or more players competing against the house, with the involvement of casino employees known as croupiers or dealers. Random number games, such as roulette and keno, are based on the selection of random numbers.

Casinos utilize a wide range of security measures to protect their assets and patrons. Security cameras are generally located throughout the facility, and the facilities are regularly patrolled by security staff. In addition, most casinos use electronic systems to monitor betting activity (chip tracking) and the results of a game (e.g., roulette wheels are electronically monitored to discover any anomalies). A large portion of casino security is also devoted to dealing with cheating and theft by both patrons and employees.