A casino is an establishment that allows patrons to place bets and play games of chance or skill. It may also include dining and entertainment options. In addition to slot machines, it usually features a variety of table games such as blackjack, roulette, and poker, as well as video poker. Some casinos specialize in one or more types of games, while others are a mix of several. A casino typically offers its patrons complimentary items, or comps, such as free drinks and food while gambling.

The casino industry in the United States is regulated by state and federal laws. In the 1980s, casinos began to appear on American Indian reservations, where they are exempt from some state antigambling laws. Some states have passed laws to prohibit or limit gaming in their jurisdictions, while others endorse it and tax it. Casinos are often a centerpiece of resort towns, with lavish hotels, restaurants, and other amenities.

Although musical shows, lighted fountains, and shopping centers help attract customers, casinos would not exist without games of chance. Slot machines, keno, blackjack, baccarat, and other games provide the billions of dollars in profits that casinos rake in each year.

The game of casino gambling has a long and varied history, with roots in Europe and Asia. In some games, skill plays a role; for example, blackjack players use knowledge of the rules to make smart bets. Other games are pure chance, such as roulette or craps. Casinos employ mathematicians and computer programmers to calculate the house edge and variance of their games, as well as develop a variety of security measures.