(i) People work for earning their livelihood. A person who is involved in production activity contributing to the flow of goods and services : in the economy is called a worker. In other words, a worker is regarded as an economic agent who contributes to the production of goods and services, thereby, to the GDP during a particular year.
(ii) A worker renders services to others and receives rewards in the form of wages, salaries or in any kind.
(iii) When an individual is engaged in a production activity or is self employed and contributes to the generation of GDI) then, that person is referred to as a worker. For example, a doctor, an engineer working in a factory, etc.