A casino is a place where people gamble for money. These establishments are often located in areas with high tourism traffic, such as resort cities and major international cities. They may also be located on American Indian reservations. In the United States, casino gambling is most prevalent in Las Vegas and Atlantic City.

In modern times, casinos have expanded to be more than just gaming facilities. They now offer hotels, restaurants, non-gambling game rooms, bars, swimming pools, and spas. Some are renowned for their luxury and elegance, such as the Bellagio in Las Vegas, while others compete to be the biggest and best in their region or the world, such as Casino Lisboa in Portugal.

While musical shows, lighted fountains and shopping centers help draw in the crowds, casinos would not exist without games of chance. Slot machines, blackjack, roulette, craps and baccarat are the games that generate the billions in profits casinos bring in each year.

While the precise origin of gambling is unknown, evidence of its popularity dates back thousands of years. Throughout history, many civilizations have practiced some form of it. Casinos are legal in most countries and have become a source of entertainment for millions of people. Because of the large amounts of cash handled in these places, both patrons and staff may be tempted to cheat or steal, either in collusion or independently; for this reason casinos have strict security measures. They typically employ surveillance cameras and other technological tools to deter such behavior.