A casino is a gambling establishment that offers various games of chance. Casinos can be huge resort-style facilities or small card rooms. They can feature table games like blackjack and roulette, as well as slot machines and video poker. Many casinos also offer a range of other entertainment, such as live music and comedy shows.

Successful casinos make billions each year, and bring in revenue for the companies, investors, and Native American tribes that own and operate them. They also generate tax revenues for the states where they are located. Casinos are a major part of the tourism industry, and many people visit them on vacation or to try their luck.

Besides offering games of chance, casinos are often known for their customer service and hospitality. They may provide free drinks and snacks while gamblers are playing, or they might offer discounted travel packages or other amenities to attract visitors. They may also employ dealers and croupiers to run their games.

The success of a casino depends on its ability to draw gamblers in large numbers. To determine the profitability of a casino, its managers analyze both house edge and variance (the average difference between expected return on bets and actual returns). The mathematical analysis is done by gaming mathematicians or computer programmers. Casinos are increasingly relying on technology to verify the integrity of their games. For example, a player’s betting chips contain microcircuitry that interacts with systems at the tables to record the amount of money wagered minute by minute; roulette wheels are monitored electronically to discover statistical deviations from their expected results.