What is the object class in C# and its relation to polymorphism?

Short answer: object is the base class for all C# types. Enables polymorphism, as any object can be referred using object type. object obj = new Car();

Example code

object is the base class for all C# types. Enables polymorphism, as any object can be referred using object type. object obj = new Car();

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.