A casino is a gambling establishment where patrons bet money on games of chance. Most of the games have a certain built-in advantage for the house, which is known as the “house edge.” Casinos make their profit from this edge, or the difference between expected value and true odds. This is often referred to as the “vig” or rake. Various rules determine the amount of this fee, depending on the game. Several types of games are played in casinos, from classic table games like blackjack and roulette to video poker and slot machines. Many casinos also have live poker tables and other card games, such as baccarat and trente et quarante. Gambling in its various forms has been around for thousands of years. The precise origins are not clear, but it is generally believed that gambling began in ancient Mesopotamia and spread throughout the world as civilization developed. Today, there are more than 3,000 gambling establishments worldwide. Most are found in the United States, but there are also casinos in many other countries. Most of these are owned by large commercial enterprises, such as hotel chains and real estate developers. Modern casinos are usually very elaborate, with a central area containing tables and slot machines. These are surrounded by dining and entertainment venues. These may include restaurants serving gourmet cuisine and shows featuring pop, rock, jazz, or other musical artists. In addition, some casinos offer spas and other luxury amenities. The term casino originally referred to a small clubhouse for Italians who wanted to socialize in a setting that was not a traditional public gambling house. However, when the mob started running these facilities and imposing their own rules, the term came to be associated with organized crime. As the mob lost control of their casinos, they were bought out by wealthy businessmen and became part of a new industry. Most states have now legalized some form of gambling. Some are run by private businesses, such as hotel and restaurant chains, while others are regulated by state governments. There are even some casinos operated by Native American tribes, which are not subject to state antigambling laws. Many of the older, more established casinos are located in Las Vegas and Atlantic City. These casinos are renowned for their glamorous attractions and upscale atmospheres. They are designed to appeal to high rollers, who are willing to spend big sums of money on entertainment and accommodations. High rollers are given special treatment by the casinos, which give them comps such as free shows and meals. Some casinos also provide limo service and airline tickets to their biggest spenders. Less extravagant comps are given to less affluent gamblers, who still receive free food and drinks at the tables and reduced-fare transportation and hotel rooms.