A casino is a gambling establishment offering a variety of games of chance to its patrons. The games usually include card games like poker and blackjack, table games such as roulette and baccarat, and machine games such as slot machines and video poker. Some casinos also offer sports betting and horse racing.

In the United States, over 40 states have legalized casinos, primarily in places with higher population density and above-average incomes. Las Vegas has been the world’s most popular casino destination, but there are casinos in other cities as well, such as Atlantic City in New Jersey and Chicago, Illinois. Casinos generate billions of dollars in annual profits for the companies, investors, and owners that run them, as well as for state and local governments that regulate and tax them.

There are various security measures that casinos take to prevent cheating and theft by patrons and staff. The most basic is cameras in all areas of the casino. More sophisticated methods are used in some places, such as “chip tracking” (where the chips have built-in microcircuitry) to monitor exactly how much is wagered minute by minute and to alert personnel to any suspicious activity; or electronic monitoring of wheel spins to spot statistical deviations from expected results.

High rollers, who place large bets, are a major source of profit for casinos. They are rewarded with comps, or free goods and services, such as hotel rooms, meals, show tickets, reduced-fare transportation and even limo service.