A casino is a gambling establishment where people wager on various games of chance. The precise origin of gambling is unknown, but it has been a part of human culture throughout history. Modern casinos typically offer a wide variety of games including poker, blackjack, roulette, craps, and slot machines. Some casinos also have restaurants, bars, and non-gambling entertainment like shows or art galleries.

Casinos make money by giving gamblers perks that encourage them to spend more than they should, or at least to stay longer than they would otherwise. These perks are called comps and can include free rooms, food, drinks, shows, or even airline tickets. The amount of the comps depends on how much a gambler spends at the casino. Casinos also earn money by charging bettors a commission on certain games, such as poker and sports betting. This charge, which is known as the vig or rake, varies by game and by casino.

Because a casino handles large amounts of cash, it is prone to fraud and theft by both patrons and employees. To prevent this, casinos employ a variety of security measures. These may include a high-tech eye-in-the-sky system that can monitor all the activity in a casino at once. Other security measures may include a heightened staff presence and cameras that can be directed to focus on particular suspicious patrons. Casinos are sometimes accused of having a negative economic impact on their host cities, because they attract local gamblers away from other forms of entertainment.