A casino is a facility for gambling, which customers can enjoy through games of chance or skill. Some casinos offer only gaming tables, while others have more elaborate and diversified offerings, including restaurants, bars, spas, hotels, and other entertainment. Casinos are also known for their bright lighting and gaudy decor, which can encourage people to gamble.

The earliest casinos were run by organized crime figures, who supplied the money for them and took sole or partial ownership of the facilities. These mob-run businesses gained a reputation for illegality, even though they often used licensed and regulated gambling establishments to hide their activities.

By the 1990s, many casinos had made major investments in technology to improve security and game play. For example, casinos use video cameras to monitor gambling areas and provide surveillance for their employees; chip tracking allows them to supervise wagers minute by minute, and roulette wheels are electronically monitored to discover any statistical deviations from their expected results.

Gambling is a popular pastime in many countries. The casino industry is a major source of income for the economy and provides employment to millions of people. In the United States, the majority of gambling takes place in state-licensed casinos. However, the industry is undergoing changes due to new laws and increased competition from offshore casinos. This is making it difficult for the industry to thrive. Casinos are also competing with online gambling, which has become increasingly popular among many consumers.