Implementation Interface:?

Short answer: The IDrawingAPI interface defines the drawing method (DrawCircle in this case). Different concrete implementations of this interface will represent various drawing styles or technologies.

Example code

public interface IDrawingAPI
{ void DrawCircle(double x, double y, double radius); }

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.