A casino is a public room or building in which gambling games such as roulette, baccarat, blackjack and poker are played. A casino may also host other forms of gaming, such as keno or bingo. It may also serve food and drink. A casino is most commonly located in a resort town or tourist attraction. Casinos are usually staffed with people who are trained to deal with gamblers. They are also trained to keep track of the amount of money that is being bet on each game and can stop play if there is a problem.

A number of states have amended their antigambling laws in the last few decades, allowing for casino-style gambling. In addition, some American Indian reservations have opened casinos, which are not subject to state law.

Generally, casino gamblers place bets with chips that have built-in microcircuitry. These devices allow casinos to monitor the exact amounts wagered minute by minute and warn gamblers of any anomalies. In other cases, electronic systems allow casinos to monitor individual slot machines and discover any statistical deviations from expected outcomes quickly. Despite this, casino security is still heavily dependent on human supervision, although technology plays an important role. In addition to surveillance cameras, many casinos use special tables and equipment to prevent cheating and other types of misconduct. In most countries, the minimum age to enter a casino is 21. However, a number of casinos are part of hotel resorts, which allow players to stay and gamble on site without having to leave the property.