A casino (or gaming house) is a building or room in which gambling takes place. Some casinos are devoted to one or more particular games, while others have a varied collection of games. The games of chance—such as slot machines, roulette, baccarat, blackjack and poker—provide the bulk of the billions in profits that casinos rake in each year. Casinos often add other forms of entertainment to attract customers, such as musical shows and lighted fountains. Many of the world’s largest and most impressive casinos are located in cities with a history of legalized gambling, such as Monte Carlo and Las Vegas.

Although modern casinos offer a wide range of entertainment, they would not exist without the games of chance that draw customers in. Despite the fact that most gamblers lose money, they return to the casino week after week and month after month to play their favorite games of chance. Casino owners understand this, and they create buildings that are designed to appeal to the senses and the imagination.

Security is another important aspect of a casino. Most casinos use a variety of technological advances to monitor their patrons and the games themselves. For example, betting chips have built-in microcircuitry that allows them to be tracked minute by minute, and roulette wheels are electronically monitored for any statistical deviation from their expected results. In addition, pit bosses and table managers keep a close eye on the activity at each game and can quickly spot blatant cheating like palming or markering.