How is inheritance implemented in C#?

Short answer: Using the colon (:) symbol. Derived class can access public/protected members of the base class. class Vehicle { public void Start() => Console.WriteLine("Start"); }

Example code

class Car : Vehicle { }
Car myCar = new Car(); myCar.Start(); // Inherited method

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.