The largest domestic crude oil and natural gas producer in India is the Oil and Natural Gas Corporation, a state-owned Maharatna enterprise. Accounting for a massive share of the nation's total domestic hydrocarbon output, ONGC operates numerous major onshore and offshore fields through its own operations and its subsidiary, Hindustan Petroleum Corporation Limited. Its continuous exploration, drilling, and extraction activities play a vital role in reducing the country's reliance on imported petroleum supplies.