Can one interface inherit another interface?

Short answer: Yes, interfaces can inherit from other interfaces, forming a hierarchy. interface IFlyable { void Fly(); } interface IAdvancedFlyable : IFlyable { void Loop(); }

Example code

Yes, interfaces can inherit from other interfaces, forming a hierarchy. interface IFlyable { void Fly(); }
interface IAdvancedFlyable : IFlyable { void Loop(); }

Real-world example (ShopNest)

ShopNest has a base PaymentMethod with virtual decimal Fee(). UpiPayment and CardPayment override the fee logic without changing the checkout caller.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.