Important of manufacturing industries
It expand trade and commerce and earns foreign exchange.
It increases employment opportunities .
It give 27 % to the GPD.
It stops regional disparities .
Classification of industries
On the bases of raw materials
They use products from animals and plants as raw material .ex; sugar ,tea ,leather etc
they are primary industries which use minerals as there raw material.ex: iron and steel ,cement,etc.
they use products for the sea and ocean as raw materials.seafood and fishoil are examples of marine based.
they use products from the forest. ex:pulp,paper etc