Component Interface (ICoffee):?

Short answer: ICoffee defines the basic methods that any coffee type must implement. This allows the decorators to work with any class that implements this interface, providing flexibility to decorate any coffee object.

Real-world example (ShopNest)

Use a GoF pattern in ShopNest only when it removes duplication or makes a change safer—explain the problem it solves in the interview.

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.