McDonald ’S is a large global multinational restaurant chain. The company's headquarters is located in Oak Brook, Illinois. Since the founders McDonald'S brothers and Ray Crocker opened the first restaurant in Illinois in 1955, it has opened in more than 120 countries and regions around the world More than 30,000 restaurants, McDonald'S represents an American lifestyle in many countries. The phrase "McDonald ’S is more than just a restaurant" accurately summarizes the business philosophy of McDonald ’S Group. In the global McDonald ’S overall system, the operation of McDonald ’S restaurant is the most important part, because McDonald ’S business philosophy and joy and deliciousness are transmitted to customers through the restaurant staff.