A casino is a gambling establishment that accepts bets on games of chance and skill. It is also a venue where concerts, shows, and other entertainment are presented. Casinos are located in cities around the world, from massive resorts to small card rooms. They bring in billions each year for local, state and tribal governments, as well as private operators and investors. Some casinos are built in conjunction with hotels, restaurants, retail shopping, cruise ships and other tourist attractions.

Casinos make money by taking a small percentage of each bet, or vigorish. The amount of the vig varies according to the game, the rules set by each state, and the number of players. The vig is a significant source of revenue for the casinos, and it allows them to afford extravagant inducements to big bettors. These may include free spectacular entertainment, luxury hotel suites, reduced-fare transportation, meals and drinks while gambling, and other perks.

The most popular casino games are slot machines, which account for a large portion of total casino revenues. They are easy to use: a player puts in a coin or paper ticket, and then pulls a handle or pushes a button to see a band of colored shapes roll on reels (actual physical wheels or a video representation of them). The machine pays out if a particular pattern appears. Casino patrons must keep the tickets or chips visible at all times, so they are not stolen; however, a casino is not immune to cheating and theft.