The primary industry mainly refers to industries that produce food raw materials and other biological raw materials, including planting, forestry, animal husbandry, aquaculture and other industries that directly target natural products.

The secondary industry mainly refers to the processing and manufacturing industry that uses the basic materials provided by nature and the primary industry for processing.

The tertiary industry refers to other industries other than the primary and secondary industries, with a wide range, mainly including intangible production departments such as transportation, communication, commerce, catering, finance, education and public services.

Extended data:

International standard industrial classification

In order to make the statistical data of different countries comparable, the United Nations issued the World Statistical Yearbook & gt (International Standard Industrial Classification). Now it is the third revision of 1988. This ISIC is divided into A-Q*** 17 departments, including 99 industry categories.

These 17 departments are:

A. agriculture, hunting and forestry;

B, fisheries;

C. mining and quarrying;

D. manufacturing industry;

E. supply of electricity, gas and water;

F. Construction industry;

G, wholesale and retail, repair industry;

H. hotels and restaurants;

I transportation, storage and communication;

J. financial intermediaries;

K. real estate and leasing industry;

L, public management and national defense;

M, education;

Noun (abbreviation for Noun) health care and social work;

O, social and personal services;

P, domestic workers;

Q. overseas organizations and institutions.

China's national economic industry classification and codes are formulated with reference to the international standard industrial classification of all economic activities, so the industry classification is basically consistent with most countries including the Organization for Economic Cooperation and Development (OECD).

References:

Baidu Encyclopedia-Three Industries