Semantic versioning / version negotiation?

Short answer: Semantic versioning (semver) uses MAJOR.MINOR.PATCH format, e.g., 1.2.0. MAJOR version changes break backward compatibility. MINOR versions add functionality in a backward-compatible manner. PATCH versions are for backward-compatible bug fixes. Version negotiation allows clients and servers to agree on an API version via headers or URL. Servers should support multiple versions and respond with supported version info.

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.