Error Handling: Use standard HTTP status codes to indicate success (e.g., 200?

Short answer: OK), client errors (e.g., 400 Bad Request), or server errors (e.g., 500 Internal Server Error). Include useful error messages in the response body.

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.