Oil & Natural Gas Corporation Limited (ONGC) is a multinational oil and gas company headquartered in Dehradun, India. It is one of the largest publicly traded companies in India by market capitalization and contributes significantly to the country's energy sector.

The primary business of ONGC involves exploring for and exploiting hydrocarbons (crude oil and natural gas), refining crude oil, marketing natural gas, and producing petrochemicals. The company operates both onshore and offshore assets across various locations in India as well as internationally.

ONGC also has a strong focus on research and development to enhance exploration technologies, improve recovery rates from existing fields, develop new sources of energy like shale gas, coal-bed methane, etc., while ensuring sustainable environmental practices.

One key factor that sets ONGC apart from its competitors is its extensive experience in deep-water drilling operations. The company has been at the forefront of technological advancements to explore deep-sea reserves efficiently. Its commitment to innovation has led to several successful projects even in challenging offshore environments.

In terms of partnerships, ONGC has collaborated with leading global players in the industry for technology transfer, joint ventures for exploration blocks abroad, expertise exchange programs, and more. These collaborations have not only facilitated knowledge sharing but have also helped ONGC expand its operational footprint beyond domestic boundaries.