The economic sector is of three aspects namely:

The primary sector

The secondary sector

The tertiary sector

The primary sector: This is the sector of the economy that makes direct use of natural resources.
The primary sector includes:
Agriculture
Forestry and fishing
Mining
Extraction of oil and gas etc.

The secondary sector: The economic sectors that create a finished, tangible product (production and construction.):
Secondary sector is sub-divided into:
Light industry
Heavy industry

The tertiary sector: Known as the service sector or the service industry.
The services include:
Attention,
Access,
Experience,
Advice and discussion.