What is 100-octane or high-octane fuel? What are its uses and benefits?

IOC plans to roll out XP100 premium grade petrol in the second phase in Chennai, Bengaluru, Hyderabad, Kochi and Kolkata. But what is high-octane petrol, what are the benefits, and where can it be used?

Gas pump with 100 octane Racing Fuel : r/mildlyinteresting

You're thinking about Octane the wrong way

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Do all cars benefit from running on high octane fuel? - Quora

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What is the best fuel for my car? A guide to different fuel types

What happens when I put 100 octanes on a 91 octane car? - Quora

Are all top tier gasolines the same? - Quora

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Fact Sheet, A Brief History of Octane in Gasoline: From Lead to Ethanol, White Papers