ONGC is the largest crude oil and natural gas Company in India, contributing around 71% to Indian domestic production. It is engaged in the oil exploration, development, and production of crude oil and natural gas. Its segments include Exploration & Production (E&P), and Refining. ONGC's on-going upstream exploratory efforts are an important segment of its core E&P Business in India with the responsibility of finding and accreting oil and gas reserves. It has three facets of hydrocarbon exploration activities viz. Deep Water, Shallow Water, and Onshore exploration activities
ONGC was set up under the visionary leadership of Pandit Jawahar Lal Nehru. Pandit Nehru reposed faith in Shri Keshav Dev Malviya who laid the foundation of ONGC in the form of Oil and Gas division, under Geological Survey of India, in 1955.
A few months later, it was converted into an Oil and Natural Gas Directorate. The Directorate was converted into Commission and christened Oil & Natural Gas Commission on 14th August 1956.
In 1994, Oil and Natural Gas Commission was converted in to a Corporation, and in 1997 it was recognised as one of the Navratnas by the Government of India. Subsequently, it has been conferred with Maharatna status in the year 2010.