Service generally refers to an activity that provides convenience among members of society. In the sociological sense, it refers to working for others, for collective interests or for a cause. Service has four characteristics: intangibility, heterogeneity, synchronization of production and consumption, and perishable. Almost everyone is familiar with the word "service", but if you want to answer "what is service", I believe few people can make it clear. "Service" and "management" are the same, and many scholars have defined them. However, because it is invisible and intangible, and its scope of application is getting wider and wider, it is difficult to simply summarize it, so there is no authoritative definition that can be generally accepted by people until today. In ancient times, "serving" meant "serving". With the development of the times, "service" is constantly endowed with new connotations. Now, "service" has become an indispensable foundation of interpersonal relationship in the whole society. Service in the sociological sense refers to working for others, collective interests or a cause, such as "serving the people". He has worked in the post office for 15 years. Service in the sense of economics refers to the labor service provided in the form of equivalent exchange to meet the needs of enterprises, public organizations or other public, and is usually associated with tangible products.