All activities that give an income in return are called economic activities. Example, people going for work in factories, banks, schools, etc.
Economic activities can be classified into different sectors on the basis of nature of work. Namely: Primary Sector, Secondary Sector, Tertiary Sector.
Primary Sector: Goods which are produced by exploiting natural resources come under the category of primary sector. This sector is also called agriculture and related sector, e.g. - cotton which is a natural product.
Secondary sector: Transformation of one good into another comes under the category of secondary sector. Manufacturing is one of the important components of this sector. Example: Transformation of sugarcane into sugar.
Tertiary sector: All production units producing services which help in the development of primary and secondary sectors come under the category of tertiary sector. This is also called the service sector. Example: Services given by doctors, teachers, lawyers etc.
