A casino is an establishment for certain types of gambling. It may also refer to a group of such establishments. Some casinos are combined with hotels, resorts, restaurants, retail shops, and other tourist attractions. In modern usage, the term casino is most often used for those facilities in Las Vegas and Macau that feature gambling. In some countries, the term is also used for a local authority-owned facility for gaming.

The term is also applied to games of chance that are conducted by a live dealer, such as blackjack and Spanish 21; games of skill, such as poker; and games played against other players rather than the house, such as roulette and craps. Casinos also offer a wide variety of other gambling activities.

In modern times, the casino industry is increasingly incorporating technology to improve security and efficiency. The use of CCTV has become commonplace, as has the implementation of player tracking systems to monitor and control game play. Moreover, many casinos are now using chip tracking to ensure that bets placed by players are recorded and accounted for.

In addition to technological advances, casinos now employ a large number of people to manage and supervise the games. These people are known as gaming mathematicians and casino analysts, and their job is to analyze the house edge and variance of the various games to determine if they are profitable for the casino. Their analysis is critical for a casino to maintain profitability and integrity.