Header Versioning:?

Short answer: Use custom headers to specify the API version. Example: X-API-Version: v1 or Accept: application/vnd.example.v1+json.

Real-world example (ShopNest)

ShopNest splits Catalog, Cart, Order, and Payment into services so teams can deploy catalog changes without redeploying payments.

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.