A casino (also known as a gambling hall or a ) is a place where people play games of chance for real money. The games that are offered in casinos vary but include slot machines, video poker, keno, and table games like blackjack and roulette. In addition to the games of chance, many casinos also feature live entertainment and dining options.

The casino industry is the largest in the world, and it is estimated that there are more than 1,000 casinos worldwide. The majority of these are located in the United States, where more than 40 states have legalized casino gambling.

Casinos are regulated by the federal and state governments and, in some cases, tribal authorities. In the United States, the major commercial casinos are found in Las Vegas and Atlantic City. Other large casinos can be found in Macau, the Philippines, and elsewhere in Europe. Casinos are often built on American Indian reservations, which are exempt from some state anti-gambling laws.

While most casino games provide a predictable long-term advantage to the house, some have a skill element that can reduce this edge to negligible levels. Players who possess sufficient skills to eliminate the house edge are known as advantage players. Casinos often use technology to monitor the games and the betting activity. For example, in a game of roulette, casinos use microcircuitry to monitor each betting chip minute by minute, and computer algorithms can detect any statistical deviation from expected results.