Give an example of polymorphism in C#.?

Short answer: abstract class Shape { public abstract void Draw(); } class Circle : Shape { public override void Draw() => Console.WriteLine("Drawing Circle"); } class Rectangle : Shape { public override void Draw() => Console.WriteLine("Drawing Rectangle"); } Shape s1 = new Circle();

Example code

Shape s2 = new Rectangle(); s1.Draw(); // Circle's Draw s2.Draw(); // Rectangle's Draw

Real-world example (ShopNest)

Checkout calls IPaymentGateway.Charge(). Razorpay and Stripe adapters implement the same interface, so ShopNest can switch gateways without rewriting the order service.

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.