Can you have properties in both interfaces and abstract classes?

Short answer: Yes, both can define properties. Interface properties are abstract by default; abstract class properties can have implementation. interface ICar { int Speed { get; set; } } abstract class Vehicle { public int Speed { get; set; } }

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.