Third-party libraries:?

Short answer: Use performance monitoring tools like why-did-you-render to detect unnecessary re-renders in functional components. Example: npm install @welldone-software/why-did-you-render Testing React Components

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.