A casino, also known as a gaming house or a gambling establishment, is an establishment that offers various types of gambling. Casinos offer a variety of games, including poker, blackjack, roulette, and craps, as well as video slots and other electronic machines. Some casinos are also known for their live entertainment offerings, such as concerts and stand-up comedy. Casinos can be found in cities around the world and are often combined with hotels, resorts, restaurants, retail shops, and other tourist attractions.

Security is a big part of the casino experience. Dealers and pit bosses closely watch patrons and their habits to spot any suspicious behavior such as palming, marking or switching cards, or even just betting in an unusual way. More subtle patterns are also picked up by observant security personnel, such as the location of betting spots on a table or the expected reactions and movements of players at specific tables.

While many people associate casinos with Las Vegas, there are casinos all over the world, from Rustenburg in South Africa to Monte Carlo in Monaco. Almost every country that permits gambling has a casino or two, and during the 1980s many American states amended their laws to permit them. Casinos also frequently appear on Native American reservations that are exempt from state antigambling laws. These casinos typically offer a more casual and relaxed atmosphere than their more upscale counterparts. They also tend to be less expensive. These factors make them popular with locals as well as tourists.