A casino is a building that houses games of chance and gambling. Modern casinos add a wide range of entertainment options such as musical shows and shopping centers, but the bottom line is that they earn billions of dollars in profits each year from the people who play their slot machines, blackjack, roulette, poker and other games of chance.

Because each game offers a mathematical expectancy, it is extremely rare for a casino to lose money on any of its offerings for even one day. To ensure this, casino managers often offer big bettors free spectacular entertainment, luxury travel and living quarters, and other extravagant inducements to keep them playing. Other casino customers may be given comps, such as free meals or hotel rooms, tickets to shows or limo service.

The most successful casinos are based in cities with large populations, especially those where tourism is important. Las Vegas and Atlantic City lead the way, but there are also casinos in other major cities including Chicago, New Orleans and Detroit, as well as on Native American reservations. In addition, casinos are now found on cruise ships and in racinos at racetracks.

Whether a casino is located in an urban or rural area, it is designed to be noisy and exciting. Players are often shouting encouragement to each other, and waiters circulating the floor bring alcoholic and nonalcoholic beverages to players at their tables. Bright, sometimes gaudy colors are used to stimulate the senses and increase excitement. In order to deter cheating and stealing, security is strict; most casinos have surveillance cameras throughout the facility.