A casino is an establishment for gambling. Many casinos combine gambling with hotels, restaurants and other entertainment. In the US, it is legal to visit most casinos, although some states prohibit the practice. Those who gamble in the casinos must be at least 21 years old. The games played in the casinos include poker, blackjack, roulette, craps, and keno. Some casinos also have sports books.

The casinos make most of their money from the people who play there, although some receive a small percentage of the money lost by players. They may also earn money by renting out rooms to guests. Casinos are a big business, with about 51 million people visiting a casino in the United States in 2002. That is about a quarter of the people over age 21.

Most casinos offer comps to big spenders, especially those who play long hours at the slot machines. This can include free hotel rooms, meals and tickets to shows. In addition, some casinos offer limo service and airline tickets to large bettors. If you want to know more about how to get the best deals at a casino, ask an employee or someone at the information desk.

In the past, gangsters controlled many of the world’s casinos, but real estate investors and hotel chains realized they could make huge profits by buying out the mobsters and running the casinos themselves. With the mob’s influence waning, legitimate casinos have expanded rapidly around the world.