India has one of the fastest growing service sectors in the world with an annual growth rate above 9 % since 2001, which contributed to 57 % of GDP in 2012 -- 13. India has become a major exporter of IT services, Business Process Outsourcing (BPO) services, and software services with $154 billion revenue in FY 2017. This is the fastest - growing part of the economy. The IT industry continues to be the largest private - sector employer in India. India is the third - largest start - up hub in the world with over 3,100 technology start - ups in 2014 -- 15 The agricultural sector is the largest employer in India 's economy but contributes to a declining share of its GDP (17 % in 2013 -- 14). India ranks second worldwide in farm output. The industry sector has held a steady share of its economic contribution (26 % of GDP in 2013 -- 14). The Indian automobile industry is one of the largest in the world with an annual production of 21.48 million vehicles (mostly two and three wheelers) in 2013 -- 14. India had $600 billion worth of retail market in 2015 and one of world 's fastest growing e-commerce markets.
what is the main source of income in india
agricultural sector