A casino is a place for gambling. Some casinos offer hotel rooms, restaurants, entertainment and retail shopping as well as gaming. Others are stand-alone buildings or combined with other attractions such as theme parks, exposition centers and other tourist facilities. The precise origin of gambling is not known, but it is believed to have existed in some form throughout history.

In the United States, the term casino can refer to a large building designed for gambling and other games of chance, or it can describe a collection of gaming tables and machines. In either case, the goal is to win money by playing the games of chance. While there are some games that require a great deal of skill, most are pure luck.

Casinos have a reputation for being places where organized crime figures gamble and meet underworld associates. In the 1950s, mafia money flowed steadily into Reno and Las Vegas casinos. In addition to supplying bankrolls, the mob took sole or partial ownership of some casinos and controlled their operations. Mafia members also fought to protect their share of the profits by intimidating casino personnel and threatening them with violence.

Some casinos are open to the general public while some are private clubs that require membership. Most casinos are located in cities and resorts, but some are also found in riverboats, on American Indian reservations and on cruise ships. Many casinos also offer comps to their high rollers, such as free meals and room service, shows or limo services. These rewards are based on how much a player spends, how long they play and what stakes they place.