This document provides background information on Oil and Natural Gas Corporation Limited (ONGC), India's largest crude oil and natural gas company. It discusses ONGC's history from its establishment in 1956 as a government commission tasked with developing India's oil and gas resources, to its transformation into a public limited company in 1993. The summary highlights ONGC's key role in establishing new oil and gas fields across India, major offshore discoveries, and diversification into downstream operations and global exploration through subsidiaries.