What are web workers?

Short answer: Web Workers allow JavaScript to run code in background threads, keeping the UI responsive.

Example code

// main.js const worker = new Worker('worker.js'); worker.postMessage('Start'); // worker.js onmessage = e => postMessage('Task done');

Real-world example (ShopNest)

ShopNest’s browser cart uses modern JavaScript: fetch APIs with async/await, modules, and clear error handling.

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.