How does LSP relate to inheritance?

Short answer: LSP is fundamentally about correct use of inheritance. While inheritance allows code reuse, LSP ensures that the behavior of subclasses remains consistent with that of the base class. If a subclass changes the meaning or violates the expectations of the base class’s behavior, it's misusing inheritance. Interface Segregation Principle (ISP)

Real-world example (ShopNest)

Open/Closed in ShopNest: add a new payment method by adding a class, not by editing a giant switch in CheckoutService.

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.