What is the difference between new and override in inheritance?

Short answer: override → Overrides a virtual method in base class (runtime polymorphism). new → Hides a base class method (compile-time hiding, not true overriding). class Vehicle { public void Start() => Console.WriteLine("Vehicle");

Example code

}
class Car : Vehicle { public new void Start() => Console.WriteLine("Car"); }

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.