Can you explain the Template Method pattern?

Short answer: Template Method defines the skeleton of an algorithm in a base class, deferring some steps to subclasses. It allows subclasses to redefine parts of the algorithm without changing its structure. It supports OCP by enabling extensions through inheritance.

Real-world example (ShopNest)

Patterns in ShopNest should solve a real pain (swappable payments, test seams)—not be added for decoration.

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.