A casino is a building or room in which gambling games are played. Most casinos offer a wide range of games, including poker, blackjack, roulette, and craps. Some even feature slot machines. Casinos are usually located in busy cities and are open 24/7. There are also online versions of casino gaming.

While some states have strict laws about casino gambling, others are more relaxed. For example, New York has legalized sports betting, and the state lottery and horse racing have age requirements lower than those for casino games. New York residents over 21 can play at most land-based casinos. However, people under 21 can gamble in some online casinos.

Most modern casinos are equipped with cameras and other security measures to protect players. Some are even staffed with full-time security guards. Moreover, they use technology to supervise the games themselves, such as “chip tracking,” which records every bet made at a table and allows the casino to monitor the amounts wagered minute by minute; or “wheel auditing,” in which the results of roulette and other wheels are electronically monitored regularly for any deviation from their expected values. Casinos may also employ rules of conduct and etiquette, such as keeping cards visible at all times while playing card games and refraining from speaking out against other players.