A casino, also called a gambling house or a gaming room, is an establishment for certain types of gambling. Most casinos are primarily known for providing entertainment through a variety of gambling games, and for offering luxurious rooms and services to their guests. Casinos are a major source of revenue for some nations, and many states regulate them.

A modern casino often has a very recognizable theme, with a large sign and plenty of flashing lights to attract customers. There are usually several tables for different games, and a bar to help patrons refresh themselves. Some casinos are open around the clock, and others offer special hours for particular groups.

Casinos make their money through the billions of dollars in profits they rake in every year from gambling. Slot machines and table games such as blackjack, roulette, baccarat, craps, and keno are the main sources of this revenue. Craps, for example, draw big bettors who are willing to pay a small percentage to win. Roulette appeals to smaller bettors, and some casinos reduce its house advantage to less than 1 percent.

Something about the casino environment seems to encourage cheating and stealing, whether in collusion or independently. Because of this, casinos devote a lot of time and effort to security measures. Some of these include security cameras, and specialized surveillance departments that monitor various areas. These departments can quickly identify any unusual behavior. They can also quickly find a lost wallet or credit card.