The industries are mainly divided into three Categories which are as follows:
(i) Primary Industries: Primary industries includes all those industries which are connected with extraction and production of natural resources and production and development of living organisms, plant etc. Primary industries may extractive industries which are involved extraction of natural resources such as, farming,
Fishing, lumbering, mining etc. and genetic industries such as animal husbandry, diary farming, poultry farming, agriculture etc.
(ii) Secondary Industries: Secondary industries include such industries which process the materials to produce goods for final consumption or for further processing by other industrial units. For example, cotton or jute into textile, timber into furniture, iron ore into steel, bamboos into pulp and so on. Secondary industries may include the manufacturing industries such as spinning, wearing, iron melting, soap making etc. and construction industries which uses the finished products of other industries for construction of movable or immovable property such as bridges, railways dams, buildings
etc. The construction industries uses the products of other industries such as bricks, cement, boulders, stones chirps, mood, bamboos etc. For major construction like dams, bridges etc. bulldozers, earth
removers, cranes etc. used.
(iii) Tertiary Industries: These industries are also known as service industries, because they provide service facilities. These industries provide support services to primary and secondary industries as well as trading activities. Transport, communication, banking,
insurance and professional services of chartered accountant, cost accountants, lawyers, doctors, resource persons etc. are also part of service industry.
Some of the illustration of tertiary industries are mentioned below:
(a) Hotels provide accommodation to various classes of people.
(b) Railways facilitate for tourist carrying man and materials from one place to another place.
(c) Nursing times provide health care and treatment facilities.
(d) Lawyers and advocates help the clients in legal matters etc.
