A casino is a place where people play gambling games. Some casinos are large resorts, and some are smaller businesses focusing solely on the types of gambling they offer. Regardless of size, most casinos evoke a similar feeling of luxury and excitement. The allure of casinos attracts both high rollers looking to experience the thrill of the game and tourists seeking a night of entertainment.

Unlike other forms of gambling, which are typically conducted in private, the games of a casino are socially interactive. Players sit at tables or stand at slot machines surrounded by other gamblers, and the atmosphere is loud and boisterous. Drinks are served at the tables and from bars, and casino employees circulate to assist gamblers. According to a survey published in March 2002 by Gemini Research, slot machines are the most popular casino game, with 50% of respondents choosing this option. Card games, especially blackjack and poker, followed with 30%, while other games such as bingo, keno, and betting on sports/racing events each garnered less than 5% of the total responses.

In addition to the usual array of games, many casinos are known for hosting a variety of events and shows. These can range from concerts by popular musical artists to world-class productions by the likes of Cirque du Soleil. These entertainment offerings add to the overall experience and help casinos differentiate themselves from competing destinations.

Most casinos are profitable, earning billions of dollars in revenue each year for the companies, investors, and Native American tribes that operate them. They also generate considerable income for the cities, states, and regions in which they are located.