A casino (also known as a gambling house or a gaming hall) is an establishment for certain types of gambling. It is located either on the land or in a building that is specially designed and constructed for that purpose. A casino may also contain entertainment venues for live performances and/or other events. Casinos make money by charging a “vig” or “rake,” which is a percentage of the total bets made by players. This vig is usually very small, less than two percent, but it adds up over time and millions of bets. It is this extra money that enables casinos to build fountains, giant pyramids, towers and replicas of famous landmarks.

Gambling is legal in most places, although many countries have laws against it or regulate it. In the US, gambling is legal in Atlantic City, New Jersey; Detroit, Michigan; Las Vegas, Nevada; Reno, Nevada; and on American Indian reservations, which are not subject to state anti-gambling laws. Most states have regulations to control the amount of money that can be won and lost by individual patrons.

Because of the large amounts of money handled within a casino, both patrons and staff may be tempted to cheat or steal, either in collusion or independently. As a result, casinos employ numerous security measures to prevent these activities. Cameras are everywhere in the casino, and electronic systems monitor betting chips to spot suspicious patterns; roulette wheels are electronically monitored regularly to detect statistical deviations from expected outcomes; and slot machines pay out a predetermined amount of money based on a random sequence of numbers.