A casino is a place where people play games of chance for money. There are many different casino games, and each game has a built in advantage for the house. The advantage can be very small, but over time it can add up to a significant sum of money. Casinos make their money by charging a vig, or a percentage of all bets made. The vig is usually very high for games of chance, such as craps or roulette, and much lower for video poker machines.

Traditionally casinos have been places that offer luxury amenities to attract gamblers. These include restaurants, free drinks and stage shows. They have also been designed around noise, light and excitement. Casinos have become increasingly popular, and are now located all over the world. Some are large, with multiple floors and thousands of slot machines. Others are smaller, with fewer games but higher payouts.

In the United States, the largest concentration of casinos is in Las Vegas, Nevada, followed by Atlantic City, New Jersey and Chicago. The number of casinos has increased dramatically in the 1990s, as more states legalized gambling and as Native American gaming grew.

Because of the large amounts of cash handled within a casino, cheating and stealing by patrons and staff is common. To combat this, the casinos employ a variety of security measures. These may include security cameras located throughout the casino, which can be monitored remotely by a room filled with banks of monitors. In addition, the routines of casino games often follow recognizable patterns, making it easier for security personnel to spot suspicious activity.