Casino is a gaming establishment that allows patrons to gamble by placing cash or casino chips on various possible random outcomes, some of which may be favorable to the player and others not. The games are usually based on chance, with some having an element of skill. Players who possess sufficient skills to eliminate the inherent long-term disadvantage of a particular casino game are referred to as advantage players.

In addition to the traditional table games, casinos also feature a wide variety of slot machines and other electronic gaming devices. These are often located in dedicated areas away from the main floor and offer a more intimate gambling experience. Some larger casinos also have discreet rooms where high rollers and VIP players can play in privacy.

Modern casinos are typically equipped with several security measures, including a physical security force and a specialized surveillance department. These departments work together to ensure the safety of patrons and employees. Casino surveillance systems may include closed circuit television (CCTV) cameras and one-way mirrors. Some casinos also have catwalks in the ceiling above the casino floor, which allow surveillance personnel to look down on patrons from a safe distance.

The most popular type of casino game is the slot machine, and many have hundreds or even thousands of them. The biggest casinos in Las Vegas and Atlantic City have more than a thousand slots each, while smaller casinos may have just a few hundred.