A casino is a gambling establishment where various games of chance and skill are played. A casino may also contain other entertainment features, such as restaurants and theatrical shows. Casinos are most commonly found in resorts, hotel-casinos, cruise ships, and other tourist attractions.

Gambling has existed in one form or another for a long time, from primitive knuckle bones and dice to the modern casinos of Las Vegas and Macau. While casinos use a wide range of luxuries to attract patrons and keep them there, the billions they rake in each year mainly come from games like blackjack, roulette, craps, slot machines, and poker, which require at least some element of skill.

In addition to video cameras and other technological measures, casinos have strict rules about ensuring that players do not cheat, steal or otherwise try to change the odds of winning or losing. The routines of casino games – how dealers shuffle cards, the locations of betting spots on a table, and the expected reactions and motions of the players all follow particular patterns, making it easy for security personnel to notice any deviation from those expectations.

In the past, the only way to play many of these games was in a private club called a ridotto – a space where wealthy people could meet to gamble and socialize without being bothered by law enforcement. However, since the late 20th century, real estate investors and hotel chains with deep pockets have taken over from mobster-controlled operations and built casinos where most of the action takes place.