A casino is a place where people play games of chance for money or other prizes. The most common casino game is a slot machine, but it is also possible to find tables for card games like blackjack and roulette. Casinos may also contain other attractions, such as restaurants or shows. The exact origin of gambling is unknown, but it has been popular throughout history in many cultures.

The modern casino is often heavily regulated by government agencies to ensure fairness and prevent criminal activity. Security measures include cameras and other surveillance equipment, as well as trained personnel to prevent cheating. Some casinos also have catwalks above the gaming floor, allowing supervisors to look down directly on the activities of players through one-way glass. Casinos are also increasingly using technology to manage their operations: for example, in a system called chip tracking, betting chips with built-in microcircuitry interact with electronic systems that monitor and record the amount of money wagered minute by minute; and roulette wheels are electronically monitored regularly to discover any statistical deviation from their expected results.

Casinos are located around the world and are a major source of income for some countries. The United States is home to the most casinos, with over 1,000 in total. Many of these are in cities that are known for their tourism and entertainment, such as Las Vegas, Atlantic City, and Chicago. Some of the largest are operated by public companies, such as Wynn Resorts and MGM Resorts International; others are run by private enterprises, including some owned by sports teams and breweries.