A casino is a building or room where people gamble and play games of chance. Besides gambling, some casinos also have restaurants and bars. Casinos range in size from huge resorts to small card rooms, and are located in many cities around the world. Casino gambling brings in billions of dollars each year for the companies, investors, and Native American tribes that operate them. State and local governments also receive casino revenues in the form of taxes and fees.

Gambling in a casino is social, and the atmosphere is designed to be noisy and lively. Often, players shout encouragement to their opponents or a dealer, and drinks are readily available. Those who win big at a table or at a slot machine are rewarded with free food, drink, hotel rooms, and show tickets. Casinos are also popular tourist destinations, and are often featured in movies, television shows, and novels.

Some casinos specialize in specific games. For example, some European casinos focus on baccarat (in its traditional form as chemin de fer), while others emphasize roulette and blackjack. In the United States, most casinos feature a variety of poker variants, and some offer regular craps tables. Many casinos have a large selection of Asian-themed games, including sic bo, fan-tan, and pai-gow.

Security is a major concern for casino operators, and sophisticated technology is used to monitor patrons and prevent cheating. For instance, a “chip tracking” system allows casinos to monitor the exact amount of money wagered on each game minute by minute, and alerts personnel when there is any anomaly.