What are websockets and how do they work with Node.js?

Short answer: Websockets enable two-way real-time communication over a single TCP connection. Use libraries like socket.io.

Real-world example (ShopNest)

A ShopNest BFF in Node.js aggregates catalog and price APIs for the React storefront.

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.