Casino (plural: casinos) is a building or room in which gambling is conducted. Typically, casinos have floor space for games like blackjack, roulette, and craps and spaces for poker rooms where players can pit their skills against other players for cash prizes. Some casinos also have stage shows and fine dining.

Gambling is a major source of revenue for casinos, and many are heavily invested in providing stimulating atmospheres to lure patrons into spending money. In addition, casinos are often equipped with video surveillance systems to monitor the movements of gamblers and to detect any suspicious activity. Some casinos are wired to allow electronic monitoring of games, such as roulette wheels or dice, for any statistical deviation from expected results.

The casinos that are most successful rake in billions of dollars annually for the companies, investors, and Native American tribes that own and operate them. In addition, state and local governments reap substantial revenue from gambling taxes and fees. Although a large number of people are attracted to casinos, gambling is not for everyone. Those who do not know the rules of responsible gambling, or have trouble resisting the temptation to bet more than they can afford to lose, are at risk of becoming addicted to casinos.

Despite the risks, the majority of Americans see casinos as acceptable and fun places to visit and play. According to a 2004 survey conducted for the American Gaming Association by Peter D. Hart Research Associates and the Luntz Research Companies, 54% of respondents believed that casino gambling was acceptable for anyone.