What are CSS preprocessors (SASS, LESS)?

Short answer: Preprocessors extend CSS with variables, nesting, mixins, and functions, compiled into plain CSS. Example (SASS): $main-color: #3498db; .button { background: $main-color; &:hover { background: darken($main-color, 10%); } } Key Takeaway: Preprocessors make CSS more modular, maintainable, and reusable.

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.