A casino is a gambling establishment where people play games of chance for money. The games are primarily table and card games, such as blackjack, poker, and roulette. Some casinos also offer video slots and other games. The casinos are owned by businesses that make a profit by taking a percentage of the funds wagered by patrons. These profits are known as the house edge. The casinos also give out complimentary items to gamblers, known as comps.

A number of states have legalized casinos. In the United States, most of the large casinos are located in Nevada and Atlantic City. Some American Indian reservations have casinos as well. Casinos are also popular in Singapore and Macau.

Because casino games are based on chance, the house always has a mathematical advantage over players. This is known as the house edge, and it ensures that the casino will make a net profit over time. Casinos are also susceptible to cheating and theft, either by patrons or employees, so they employ a variety of security measures. These include cameras that monitor the entire casino floor, and elaborate surveillance systems that provide a high-tech eye in the sky that can be directed to specific suspicious patrons.

Because the casinos are essentially businesses that depend on the customers, they make efforts to draw in people and keep them coming back. They offer a range of amenities that may include restaurants, bars, spas, and theaters. Some even host sporting events, such as boxing and horse racing.