A casino is a place where people can gamble on games of chance. It is also a popular form of social entertainment, and some casinos offer free drinks and stage shows for their customers. Some of the best casinos in the world are located in Las Vegas, Nevada, although they have been popping up all over the country and the world. Some have elaborate themes and features, while others are more modest in size.

While music, dancing and food are common attractions at most casinos, gambling is the primary activity that draws in most patrons. Casinos have strict rules governing the behavior of players and enforce them through a combination of cameras, security personnel and internal procedures. For example, all slot machines are wired to a central server that monitors their outputs and detects statistical deviations that may signal cheating. Each table game has a pit boss or manager who keeps an eye on the dealers and notes their betting patterns.

Despite their seamy image, casinos are very profitable businesses. In 2005, they brought in more than $21 billion in revenue. Their customer base consists mainly of people with above-average incomes, especially older adults. These patrons tend to gamble longer and more frequently than other types of gamblers, and are willing to take greater risks for higher rewards. Casinos are increasingly focusing their investments on high-stakes gamblers, who are often given special rooms and personalized attention by casino staff. They also receive complimentary items and cash back on their losses.