A casino is an establishment where people can gamble and play games of chance. Unlike lotteries or Internet gambling, casinos require a physical location and offer social interaction between players. They also provide entertainment through concerts and other events. They make billions of dollars a year for the companies, investors, and Native American tribes that operate them. Local governments also reap casino revenues in the form of taxes and fees.

Casinos are designed around noise, light and excitement, and create a unique atmosphere that attracts people to gamble. They often feature slot machines, table games and poker rooms as well as luxurious hotels and restaurants. Some also have art installations and fountains, and have hosted celebrities such as Frank Sinatra and Celine Dion. Casinos also advertise heavily on television and the internet, and many have websites where gamblers can find odds and information about games.

Most casino games have built in advantages for the house, which can be very small (less than two percent) but add up over millions of wagers. These advantages are known as the house edge or expected value, and can vary between games. In games where players bet against each other, such as poker and blackjack, the house collects a commission called the rake.

As a result, the casinos must continually invest in security to protect their profits and ensure that patrons are not cheating or colluding to win. Cameras are constantly monitoring casino patrons, and electronic systems are used to monitor the movements of betting chips in real-time and detect any suspicious activity.