McDonald's is an American hamburger and fast food chain. Founded in 1940, it was originally a barbecue restaurant run by Richard and Maurice McDonald in San Bernardino, California. In 1948, they reorganized their hamburger shop according to the principle of production line. The first McDonald's franchise using the arch logo opened in Phoenix, Arizona in 1953. Businessman Ray Kroc joined the company as a franchise agent in 1955, then bought the chain from the McDonald brothers. McDonald's, headquartered in Oakbrook, Illinois, has confirmed plans to move its global headquarters to Chicago in early 2018. Today, McDonald's has become one of the largest catering chains in the world. As of 2016, McDonald's has about 69 million customers in more than 100 countries / regions every day. McDonald's has about 36900 outlets across the country. McDonald's mainly sells hamburgers, cheeseburgers, chicken products, French fries, breakfast food, soda, milkshakes, packaging and desserts. The company has expanded its menu to include salads, fish, smoothies and fruits in response to changes in consumer tastes and criticism for the unhealthy nature of its food. McDonald's restaurants are operated by franchisees, affiliated companies or companies themselves. McDonald's revenue comes from the rent paid by the franchisor, royalties and fees, and the sales of the company's restaurants. McDonald's is the world's second largest private employer (after Wal Mart, which has 1.9 million employees), with 1.5 million franchisees, according to a report released by the BBC in 2012.