State Interface (ITrafficLightState): ● The ITrafficLightState interface defines a method (Change) that allows the state to transition to another state. The method accepts a TrafficLight object as

Short answer: parameter to facilitate the state change.

Explain a bit more

public interface ITrafficLightState { void Change(TrafficLight light); } Each concrete state class (Red, Green, Yellow) will implement this interface, defining the specific behavior of the traffic light for that state. parameter to facilitate the state change. public interface ITrafficLightState { void Change(TrafficLight light); } Each concrete state class (Red, Green, Yellow) will implement this interface, defining the specific behavior of the traffic light for that state.

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.