A casino is an establishment for gambling. Some casinos also offer restaurants, retail shopping, cruise ships, and other tourist attractions. The term can also refer to a specific building or room where a particular type of gambling takes place, such as an Indian gaming house, a horse racing track, or an indoor amusement park. Casinos can be located in cities, airports, hotels, and resorts.

The largest concentration of casino gambling is in the United States. The Las Vegas Valley is home to more than a dozen major casinos, with another 40 or so scattered throughout the nation. Most of these casinos are open around the clock, and offer a variety of games to patrons.

Most of the games played in casinos involve chance, but some require a level of skill. The house always has a slight statistical advantage over the players, which is called the house edge. This advantage can be small, less than two percent, but it adds up over the millions of bets placed by players each year. Casinos make their money by charging a commission, or rake, on some bets, and by taking a cut of the action at other games.

In addition to commissions and rakes, casinos take steps to prevent cheating and theft by patrons and employees. Many casinos use chips instead of cash, to make it harder for players to keep track of how much they are winning or losing. This practice is especially common in Asia, where many casinos offer traditional Far Eastern games like sic bo and fan-tan.

Casino security starts on the floor, where workers watch games and patrons closely. Dealers are trained to spot blatant cheating and can be alerted to suspicious betting patterns. Pit bosses and managers at table games have a broader view of the tables, and can look out for other types of behavior, such as players signaling to one another or to other dealers. Casinos also employ surveillance systems that allow security staff to monitor the activities of all tables and slot machines at once.

The casinos of the United States are among the most lucrative and famous in the world, and some feature spectacular architecture or other attractions. But they are also notorious for their high crime rates, and the mob often has had a strong influence on the management of some casinos. The mobsters supplied the initial capital for many Nevada casinos, but as their criminal empires expanded they became involved in the day-to-day operations and sometimes even owned or controlled them entirely.

Casinos are increasingly being built as part of larger resorts and entertainment complexes, such as the MGM Grand in Las Vegas. This trend is driven by increased tourism and the desire to attract customers from other parts of the country and the world. Casinos are increasingly being seen as a way to increase revenue and boost economic growth in local communities. In the United States, there are now more than half a million people employed in casino-related jobs.