There are four key industrial economic sectors: the primary sector, largely raw material extraction industries such as mining and farming; the secondary sector, involving refining, construction, and manufacturing; the tertiary sector, which deals with services (such as law and medicine) and distribution of manufactured goods; and the quaternary sector, a relatively new type of knowledge industry focusing on technological research, design and development such as computer programming, and biochemistry. A fifth, quinary, sector has been proposed encompassing nonprofit activities. The economy is also broadly separated into public sector and private sector, with industry generally categorized as private. Industries are also any business or manufacturing. Industries can be classified on the basis of raw materials, size and ownership.

• Raw Materials: Industries may be agriculture based, Marine based, Mineral based, Forest based.
• Size: It refers to the amount of capital invested, number of people employed and the volume of production.
• Ownership: Industries can be classified into private sector, state owned or public sector, joint sector and co-operative sector

Industry in the sense of manufacturing became a key sector of production and labour in European and North American countries during the Industrial Revolution, which upset previous mercantile and feudal economies through many successive rapid advances in technology, such as the steel and coal production. It is aided by technological advances, and has continued to develop into new types and sectors to this day. Industrial countries then assumed a capitalist economic policy. Railroads and steam-powered ships began speedily establishing links with previously unreachable world markets, enabling private companies to develop to then-unheard of size and wealth. Following the Industrial Revolution, perhaps a third of the world's economic output is derived from manufacturing industries—more than agriculture's share.

Many developed countries and many developing/semi-developed countries (People's Republic of China, India etc.) depend significantly on industry. Industries, the countries they reside in, and the economies of those countries are interlinked in a complex web of interdependence.

Industry is divided into four sectors. They are:

As a country develops people move away from the primary sector to secondary and then to tertiary.

There are many other different kinds of industries, and often organized into different classes or sectors by a variety of industrial classifications.

Industry classification systems used by the government commonly divide industry into three sectors: agriculture, manufacturing, and services. The primary sector of industry is agriculture, mining and raw material extraction. The secondary sector of industry is manufacturing. The tertiary sector of industry is service production. Sometimes, one talks about a quaternary sector of industry, consisting of intellectual services such as research and development (R&D).

Market-based classification systems such as the Global Industry Classification Standard and the Industry Classification Benchmark are used in finance and market research. These classification systems commonly divide industries according to similar functions and markets and identify businesses producing related products.

Industries can also be identified by product: chemical industry, petroleum industry, automotive industry, electronic industry, meatpacking industry, hospitality industry, food industry, fish industry, software industry, paper industry, entertainment industry, semiconductor industry, cultural industry, poverty industry

• labor-intensive industry - capital-intensive industry
• light industry - heavy industry

Noun

industry (countable and uncountable; plural industries)

1. (uncountable) The tendency to work persistently.

   Over the years, their industry and business sense made them wealthy.

2. (countable, business, economics) Businesses of the same type, considered as a whole.

   The software and tourism industries continue to grow, while the steel industry remains troubled.

   The steel industry has long used blast furnaces to smelt iron.

3. (uncountable, economics) Businesses that produce goods as opposed to services.

   There used to be a lot of industry around here, but now the economy depends on tourism.

4. (in singular, economics) The sector of the economy consisting of large-scale enterprises
5. (European software patents) Automated production of material goods.
   • 2007, Dominique Guellec; Bruno van Pottelsberghe de la Potterie, The economics of the European patent system, page 122:

     It is a classical and restricted view both of industry (it excludes service sectors, now 70% of the GDP of developed economies)

• (tendency to work persistently): diligence; application
• (businesses of the same type): sector; field
• (businesses that produce goods): manufacturing

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