What is React and why would you use it?

Short answer: React is a JavaScript library for building user interfaces, mainly for single-page applications. It helps developers create reusable UI components, manage state efficiently, and update the UI in a performant way. ✅ Why use React? Easy to break UIs into components Efficient updates with Virtual DOM Rich ecosystem (React Router, Redux, etc.) Backed by Facebook and a large community

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.