A casino is a gambling establishment where people can play games of chance and win money. It is estimated that casinos earn billions of dollars a year from their patrons. The money is used to create elaborate hotels, shopping centers and entertainment venues. Casinos would not exist without games of chance like slot machines, blackjack, baccarat, roulette and craps.

The precise origins of gambling are not known, but it is generally believed that some form of it has been seen in almost every society throughout history. Early proto-dice, carved six-sided dice and even the bones of hunted animals have been found in archaeological digs. The modern concept of a casino as a place where people can find many forms of gambling under one roof developed in the 16th century when a gambling craze swept Europe. Italian aristocrats often held private parties, called ridotti, where gambling was the main attraction.

Casinos rely on technology to prevent cheating and theft by both patrons and staff. Security cameras that can be adjusted to focus on particular suspicious areas are a basic feature. Other more sophisticated systems allow casino staff to monitor the actions of individual players at table games with a view that cannot be blocked or hidden; or to oversee the performance of roulette wheels and other mechanical devices for statistical deviations that might indicate tampering.

Because of their virtual assurance of gross profit, casinos regularly offer big bettors extravagant inducements such as free spectacular entertainment, hotel rooms and reduced-fare transportation. They also reward frequent players with comps, such as free meals and hotel rooms, show tickets or limo service and airline tickets.