Abstract Expression (IExpression):?

Short answer: The IExpression interface declares an Interpret method, which is the core of the interpreter pattern. This method is used to interpret and evaluate expressions. public interface IExpression

Example code

{
int Interpret();
}

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.