How do you implement Lazy loading with design patterns?

Short answer: Use the Proxy or Virtual Proxy pattern where a placeholder object controls access to the real object and defers its creation until needed. In .NET, Lazy<T> provides built-in lazy loading.

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.