A casino is a gambling establishment that features roulette, gaming tables for card games and dice, and slot machines. It may also offer other forms of entertainment such as a sportsbook, buffet, and stage shows. While most people associate casinos with Las Vegas, they are found worldwide. Some are even legal in other states.

Although some state laws prohibit casino gambling, the majority of states allow it in some form. The most popular form is through commercial land-based casinos. In 2022, these accounted for more than 88% of total revenue. The second most popular form is through online casinos. Online casinos feature a variety of gambling products, including roulette, blackjack, craps, poker, and video slots. Some even have live dealers. The number of legal online casinos continues to grow.

Historically, casino ownership was often tied to organized crime. Mob figures had plenty of money and were willing to invest it in casinos, despite their seamy image. They took sole or partial ownership of many casinos and used their influence to control gambling activities. Federal crackdowns and the threat of losing their casino licenses forced these owners to get rid of mafia ties, however. Real estate investors and hotel chains were more willing to take the risk and bought out the mobsters.

Modern casinos have a large security force that patrols the premises and responds to reports of suspicious or definite criminal activity. Specialized surveillance departments monitor the activities of guests and patrons through closed circuit television systems. The surveillance systems often use a combination of cameras and sophisticated computer software that can detect the slightest statistical deviations from the expected behavior of players at various table games.