A casino, also known as a gambling hall, is a place where people can play a variety of games of chance for money. Many casinos add other entertainment elements such as restaurants, free drinks and stage shows to attract gamblers. However, the main attraction remains the gambling activities themselves. Modern casinos are often elaborately themed, and some are located in exotic locations. Casinos may also offer comps to regular players, which are free goods or services such as food, hotel rooms and tickets to shows.

Some places are almost defined by their casinos, such as Monte Carlo. Others have a more limited scope, such as the Dragonara Palace in Malta. The majority of casinos are located in the United States, where 40 states have legalized them.

The first American casinos began to appear in the early 20th century, largely in Nevada and California. Their origins predate those of European casinos, which were established in the 18th and 19th centuries and had a significant influence on gambling in the US.

Most casinos have security measures in place to prevent cheating and other irregularities, and they are regularly inspected by regulators. In addition to a visible presence of security staff, many have electronic systems that monitor and oversee gaming activities. For example, “chip tracking” allows a casino to see the exact amount wagered on each chip minute by minute; roulette wheels are electronically monitored and any statistical deviations immediately detected. Some casinos also use technology for general surveillance and internal auditing.