A casino is a building or room used for social amusements, particularly gambling. Its use may be legal or illegal, depending on the jurisdiction. The classic example of a casino is the Monte Carlo in Monaco, which has long been a major source of revenue for the principality. Casinos have also become a significant source of income in many other countries, especially in the United States where casino gambling was first introduced in Atlantic City in 1978 and then spread throughout the country after state anti-gambling laws were repealed in the 1980s.

In the US, a casino is typically a large facility that houses a variety of games of chance and other entertainment options such as restaurants, bars, and theaters. Its operations are overseen by a gaming commission. In addition to the games of chance, some casinos also offer a variety of other activities such as poker rooms and sports betting sections.

The games of chance offered in a casino provide an inherent long-term advantage to the house, which is known as the house edge. Players who have sufficient skills to eliminate this advantage are referred to as advantage players. Some of the most popular casino games include blackjack, roulette, and video poker.

While most people associate casinos with the bright lights and glitz of Las Vegas, they can be found all over the world. For example, there is a casino in Macau, which is one of the most visited destinations by international travelers. Casinos can also be found on Indian reservations, which are exempt from some state anti-gambling regulations.