A casino, also known as a gambling house or a gaming hall, is an establishment for certain types of gambling. Casinos are often built near or combined with hotels, restaurants, retail shops or other tourist attractions. In some countries, casinos are legalized and regulated by government authorities. In the United States, the majority of commercialized casinos are located in Las Vegas and other locations in Nevada. A small number of other states allow limited forms of casino gambling, such as lottery games and horse race betting.

Gambling is an entertainment industry and a major source of income for many cities, regions and nations. In the United States, casino gambling is a multibillion-dollar business that attracts visitors from all over the world. Some people earn a living as professional gamblers, and others work in various positions that are related to the gaming industry, such as dealers, pit bosses, and croupiers.

Most states regulate casino gambling, but laws and regulations differ significantly between jurisdictions. In general, to play slot machines and most table games at a land-based casino, you must be 21 or older. However, some states allow 18-year-olds to participate in racinos and other regulated gambling establishments.

Because large amounts of money are handled in a casino, employees and patrons may be tempted to cheat or steal, either in collusion or independently. As a result, most casinos have strict security measures in place. Some of these include CCTV, employee screening, and limiting access to areas where gambling is permitted.