Casinos have elaborate security systems that allow casino employees to watch the entire casino at once. Cameras are mounted in the ceiling and are positioned in each window and doorway. They are calibrated to focus on suspicious patrons and video feeds are recorded for later review. Security systems are also used to keep track of payouts on slot machines, as these are randomly determined by computer chips.
Casinos were originally public entertainment halls that featured dancing and music. However, as the 19th century progressed, they began to grow into a collection of gaming rooms. Monte-Carlo, for example, opened its casino in 1863. It has since become a major source of revenue for the principality of Monaco.
The most popular casino game is slot machines. It generates more revenue for casinos than any other game. The house edge comes from a rake, which is a small percentage of each pot. In addition, some casinos charge poker players according to the length of time they spend in the poker room. Nonetheless, the house advantage is small.
The concept of the casino spread throughout Europe. French people invented the first games that have become familiar to casino patrons today. The casino became more popular in Italy, where it was originally a private club for Italians. As more Italians became wealthy, the casino became a popular venue for gambling.