What is the Virtual DOM and how does React use it?

Short answer: The Virtual DOM is a lightweight in-memory representation of the real DOM. React updates the Virtual DOM first and compares it with the previous version, only applying the necessary changes to the real DOM. ✅ Benefit: Improves performance by reducing real DOM operations.

Real-world example (ShopNest)

ShopNest’s storefront is React: components for ProductCard, CartDrawer, and CheckoutForm, with hooks for local UI state.

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.