A casino is a gambling establishment where gamblers place bets on various events. The games offered are usually based on chance, and the house takes a percentage of the bets. Some casinos are very large, such as the Casino at Monte Carlo, which has a floor area of almost a quarter of a million square feet. Other casinos are more modest in size, but still offer the thrill of gambling and well-rounded experiences. Some of the best casino resorts have even become family-friendly and feature restaurants, shows and attractions.

Casinos would not exist without their main attraction: games of chance. Slot machines, blackjack, roulette and craps provide billions of dollars in profits for casino owners each year. While lighted fountains, musical shows and shopping centers attract guests, it is the games that keep them coming back.

The precise origins of gambling are unknown, but it is believed that people have gambled for money since ancient times. It became a popular pastime in medieval Europe and spread to the Americas with European exploration. Today casinos are a major source of revenue for many nations and cities around the world, and they continue to evolve to meet ever-changing customer expectations.

The top two largest casinos in the United States are located in Las Vegas and Atlantic City. The third biggest casino is Foxwoods Resort Casino in Ledyard, Connecticut, which is owned by the Mashantucket Pequot Indian tribe. It has over 4.7 million square feet of gaming space and features more than 7,000 slot machines, 17 different table games and a two-story arcade.