Facade (HomeTheaterFacade):?

Short answer: The Facade class simplifies interactions with the subsystem by providing a unified interface for the user. It wraps the complex subsystem and provides higher-level methods that internally call the appropriate subsystem methods. public class HomeTheaterFacade

Example code

{
private readonly Amplifier _amplifier;
private readonly DVDPlayer _dvdPlayer;
public HomeTheaterFacade(Amplifier amplifier, DVDPlayer dvdPlayer) {
_amplifier = amplifier;
_dvdPlayer = dvdPlayer;
}
public void WatchMovie(string movie)
{ _amplifier.On(); _dvdPlayer.Play(movie); }
public void EndMovie()
{ _amplifier.Off(); }
}

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.