A casino (or gambling house) is a place for people to gamble on games of chance for money or other prizes. Modern casinos often combine gambling with other entertainment activities, such as restaurants, bars, and live music. Some are themed, such as those based on famous films or landmarks. A casino can also be a place where people socialize and meet friends.

The word “casino” comes from the Italian word for little castle, and the first such establishments were built in the 16th century in cities such as Venice. They were small clubs for local Italians to meet in, and they were a precursor to today’s casinos, which are often large resort facilities with multiple gaming rooms, restaurants, and hotels.

Although some casinos have games with an element of skill, most are pure chance. The mathematically determined odds of each game give the house an advantage, or edge, which can be very small, but over millions of bets it adds up to billions in profits for the casinos. The house edge can vary by game, and is sometimes known as the vig or rake. Some casinos offer complimentary items or comps to their players, such as free meals, hotel rooms, shows, and limo service.

Most casino owners are legitimate businessmen, but in the early days of Las Vegas and Reno, many were organized crime figures who had plenty of cash from drug dealing, extortion, and other illegal rackets. The mobsters were not only the original backers of casinos, they became involved in the operations personally, taking sole or partial ownership and influencing the outcomes of some games by threatening or coercing casino personnel.