What are breakpoints in Bootstrap?

Short answer: Breakpoints define responsive screen widths: Breakpoint Prefix Size Extra small none <576px Small sm ≥576px Medium md ≥768px Large lg ≥992px Extra large xl ≥1200px XXL xxl ≥1400px

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.