A casino (also known as a gambling house or gaming establishment) is a facility for certain types of gambling. Casinos are very popular and are found in many places around the world. They are often combined with hotels, resorts, restaurants, retail shops, and cruise ships. Many states have legalized casinos.

A wide variety of games can be played at a casino, including poker, blackjack, roulette, craps, and slot machines. In addition, there are typically one or more bars and restaurants where alcoholic drinks are served. The entire atmosphere of a casino is designed around noise, light, and excitement. It is not uncommon for players to shout encouragement at each other or the dealers. Casinos use bright and sometimes gaudy floor and wall coverings to stimulate the senses, and red is a very popular color since it is thought to make people lose track of time.

Casinos are constantly evolving to keep up with the needs and demands of their customers. For example, in the 1990s, many began using technology to monitor the money flow within the facilities. For instance, chips with built-in microcircuitry allow casinos to track the amount of money bet minute by minute; and roulette wheels are electronically monitored so that anomalies can be quickly discovered.

Despite their seamy reputation, casinos are very profitable enterprises. They bring in billions of dollars each year for the companies, investors, and Native American tribes that operate them. They also generate a significant amount of revenue for state and local governments.