McDonalds USA, LLC is a publicly traded U.S. company founded in 1954 and headquartered in Oakbrook, Illinois, USA. MCD is the world's largest fast food chain. McDonald's restaurants are rolled out worldwide and are located in more than 100 countries on six continents. McDonalds has become the most valuable brand in the global restaurant industry. The McDonald's Corporation's best-known McDonalds brand has more than 31,000 fast casual restaurants in 121 countries around the world. In addition, McDonalds USA, LLC now controls other restaurant brands such as Aroma Cafe, Boston Market, Chipotle Mexican Express, Donatos Pizza and Pret a Manger. The highest standards of service delivery are Quality, Service, Clean and Value, or QSC&V principles. This is an important principle that best reflects the characteristics of McDonald's.