IOCL is the downstream company in the Oil and Gas Sector which are majorly into refinery and retailing of Oil, Petroleum and Natural Gas and which actually penetrate into the product markets.

For more information about IOCL and its recruitment through Gate, you can go through the below article and let me know if you have any further doubt -

All about IOCL

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Indian Oil Corporation (IndianOil) is India's largest commercial enterprise, with a sales turnover of Rs. 4,38,710 crore (USD 65,391 million) and profits of Rs. 19,106 crore (USD 2,848 million) for the year 2016-17.

You can also check the details from the given below link

IOCL Details