A casino is a gambling establishment where people can gamble on various games of chance. These games may include poker, blackjack, craps, roulette, and video slots. In the United States, there are over 1,000 casinos. Some are stand-alone facilities, while others are part of larger resorts or hotels. Casinos also offer a variety of entertainment options, such as concerts and shows. In some jurisdictions, casinos are operated by government-licensed organizations. These entities are usually regulated by state or local laws and must comply with minimum operating standards. Casinos are also subject to ethical and security issues, as they handle large amounts of money and are often located in areas with high crime rates.

The precise origin of gambling is not known, but it is believed to have existed in some form throughout history. Evidence of gambling has been found in many societies, from Ancient Mesopotamia and Greece, to Napoleonic France and Elizabethan England. Today, casino gambling is a worldwide phenomenon, with the largest concentration of casinos in Las Vegas, Nevada.

While there are some places that are essentially defined by their casinos, like Monte Carlo, most cities have a variety of other attractions that draw visitors. Casinos are also designed to stimulate the senses, with bright lights and unique ornamentation. In addition, human beings are attracted to noise and movement, so the clang of coins dropping on slot machines is a constant in most casino environments. These sounds are often accentuated by background music, which is played at a consistent volume to make the experience more stimulating.