1. The primary industry refers to the industries that produce aquatic, native and agricultural products, such as agriculture, forestry, fishery and so on;

2. The secondary industry refers to industries that process raw materials for the primary industry and this industry, such as mining, manufacturing and construction.

3. The tertiary industry refers to other industries except the primary industry and the secondary industry. These industries are independent, such as transportation, catering, real estate and so on.

: the status of the three major industries

1. The primary industry is the foundation of national economic development: agriculture as the primary industry can provide the most basic material foundation for national development and meet people's normal life needs;

2. The secondary industry can promote the rapid development of the national economy: with the material foundation as the guarantee, the secondary industry has emerged. Through the development and utilization of major mineral resources, oil and other resources, it can promote the development of the primary industry and improve the economic level of the country;

3. The tertiary industry serves the primary industry and the secondary industry, and promotes the progress of the primary industry and the secondary industry. The tertiary industry is a supplement to the primary industry and the secondary industry and can serve it.

the significance of tertiary industry

the prosperity of tertiary industry is an important feature of modern economy. In the contemporary world, the development level of tertiary industry has become one of the important symbols of the development level of productive forces in a country or region. Accelerating the development of the tertiary industry is of great significance for promoting the rapid development of the national economy and improving people's living standards:

(1) Accelerating the development of the tertiary industry can effectively promote the industrialization and modernization of China.

(2) Accelerating the development of the tertiary industry can expand the fields of employment and the number of employees, and ensure social stability.

(3) accelerating the development of the tertiary industry can significantly improve people's living standards, improve people's quality of life and promote the construction of socialist spiritual civilization.

The relationships among the three industries are interdependent and mutually restrictive:

1. The primary industry lays the foundation for the secondary industry and the tertiary industry

2. The secondary industry is the core of the three industries and plays a leading role in the primary industry

3. The primary and secondary industries create conditions for the tertiary industry, and the development of the tertiary industry promotes the progress of the primary and secondary industries.