The three sectors that contribute to the GDP are primary sector (or) Agricultural Sector, Secondary Sector (or) Industrial Sector, Tertiary Sector (or) Service Sector.
Eg: Agricultural based allied activities. Farm, fishing:
1. Mining and Foresty – Primary sector.
2. Major Industries and small scale Industries – Industrial sector.
3. Transport and Communication, Post and Telegraph, Banking, Education, Entertainment, Health care and Information Technology