Generally speaking, service industry refers to the collection of production departments and enterprises that produce and sell service goods. Services: Services are things that the public needs, such as transportation, communication facilities, hospitals or energy supply, which are provided by the government or official institutions in a planned and organized way. Customer service: Customer service refers to the formulation, recipe removal, technical consultation and testing of most consumer goods, such as food, herbs, beverages, medicines, vitamins, medicines, cosmetics, hairdressing products, household cleaners, paints, plastics, metals, waxes, paints, minerals, ceramics, building materials and water, indoor air quality testing, non-medical forensic testing and fault analysis. In the practical work of national economic accounting, service industry is generally regarded as the tertiary industry. In the industry classification of the national economy, except agriculture, industry and construction, all the other fifteen industrial sectors exist (the industry classification of the national economy is subdivided into 1, agriculture, 2, mining, 3, manufacturing, 4, production and supply of electricity, fuel and water, and 5, construction and other five physical commodity production departments). Namely 1, transportation, warehousing and postal services 2, information transmission, computer services and software services 3, wholesale and retail services 4, accommodation and catering services 5, finance 6, real estate 7, leasing and business services 8, scientific research, technical services and geological exploration 9, water conservancy, environment and public facilities management 10, residential services and other services/kloc. The fundamental difference between education 12, health, social security and social welfare 13 and other industrial sectors is that the service industry produces service products, which have the characteristics of immateriality, non-storability and simultaneous production and consumption. There are differences between service industry and tertiary industry in daily application. Generally speaking, "service industry" is used to describe the industrial sector of the national economy through specific industrial sectors of the national economy, such as agriculture, industry and construction. "Tertiary industry" is an industrial sector that describes the national economy through the development level of the national economy, such as the primary industry (hereinafter referred to as the primary industry) and the secondary industry. It should be noted that: 1, service industry can be divided into service industry and service industry. The production departments and enterprises that provide service products for value-added purposes are collectively referred to as service industries; In order to meet the needs of the public, the government's behavior of providing service products is called service commitment. Strictly speaking, tourism is not a relatively independent service department. In addition to travel agency activities belonging to the service category under leasing and business services, tourism facilities construction, tourism catering, tourism accommodation, tourism shopping, tourism culture, tourism product development and other activities belong to other industrial sectors. This is obviously different from the popular concept.