McDonald’s Corporation is the largest fast food hamburger restaurant chain in the world, headquartered in Oak Brook, IL. McDonald’s operates more than 35,000 restaurants in 118 countries worldwide. McDonald’s began in 1940 as a single barbecue restaurant owned by Richard and Maurice McDonald, but they redeveloped their restaurant into a hamburger stand in 1948. Ray Kroc joined their team in 1955, and later purchased the chain and oversaw worldwide growth through franchising. McDonald’s primary sells hamburgers, chicken sandwiches, french fried, breakfast items, and desserts. The Big Mac is McDonald’s signature sandwich.