A casino is a facility where people can play games of chance. The word derives from the Latin “caino,” meaning “coin.” Modern casinos are often large and opulent, with lavish decor and impressive architecture. They may feature numerous gambling tables and slot machines, as well as restaurants and entertainment venues. Some are owned by major corporations, while others are operated by local governments or Native American tribes. In the United States, casinos are regulated by state law and must be licensed. They are usually located in areas with high population density, such as Las Vegas and Atlantic City.

A defining characteristic of modern casinos is their use of technology. Video cameras and computer systems are used for security, surveillance, and monitoring the games themselves. For example, betting chips with built-in microcircuitry allow casinos to track and monitor the exact amount wagered minute by minute; roulette wheels are electronically monitored regularly to discover any statistical deviations from their expected results. Some casinos are entirely electronic and have no live dealers; instead, players place their bets by pushing buttons.

Many casinos offer perks to encourage gambling, such as free meals and hotel rooms. These offers are known as comps. During the 1970s, when casinos first became popular, the strategy was to fill hotel rooms and gambling floors with customers in order to generate revenue. A study by Gemini Research found that in Nevada, more than half of all respondents who acknowledged participating in casino gambling preferred to gamble on slot machines. The next most popular game was card games, followed by table games such as blackjack and poker.