What is the difference between id and class attributes?

Short answer: id is unique and used for a single element. class can be used for multiple elements.

Example code

<div id="main-header"></div> <div class="card"></div> <div class="card"></div> Key Takeaway: Use id for specific targeting; class for grouping and styling.

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.