A casino is an establishment for certain types of gambling. Some casinos are combined with hotels, restaurants, resorts, retail shops or cruise ships. Casinos are also known for hosting live entertainment, such as stand-up comedy, concerts and sports. They may also offer electronic gaming, such as video poker and roulette.

A large amount of money often changes hands within a casino, making it possible for patrons and employees to cheat or steal. This is why most casinos have security measures in place. Cameras located throughout the casino are one common tool used to deter potential crime. Casino staff are also trained to watch for betting patterns that could indicate a player is trying to cheat. Table managers and pit bosses are especially vigilant about observing gamblers’ actions, noting how they move around the table and whether or not they appear to be counting cards.

Gambling games vary in their rules and payouts, but most have a mathematical expectancy that guarantees the house a profit over time. As a result, a casino can never lose more than it can afford to pay out in winnings. This virtual assurance of gross profit allows casinos to offer extravagant inducements to big bettors, such as free rooms, hotel suites, meals, shows and reduced-fare transportation. The most popular casino games are slot machines, blackjack, poker and roulette. Casinos are a major source of revenue for many countries and can be found in cities all over the world.