Answer :Oil and Natural Gas CORPORATION Limited (ONGC) is an Indian multinational oil and gas company headquartered in Dehradun, Uttarakhand, India. It is a PUBLIC Sector Undertaking (PSU) of the Government of India, under the administrative CONTROL of the Ministry of Petroleum and Natural Gas. It is India’s largest oil and gas exploration and production company. It produces AROUND 77% of India’s crude oil (equivalent to around 30% of the country’s total demand) and around 62% of its natural gas.t is involved in exploring for and exploiting hydrocarbons in 26 sedimentary basins of India. Maharatna ONGC is the largest producer of crude oil and natural gas in India, CONTRIBUTING around 70 per cent of Indian domestic production. The crude oil is the raw material used by downstream companies like IOC, BPCL, HPCL to produce petroleum products like Petrol, Diesel, Kerosene, Naphtha, and Cooking Gas-LPG.