Versioning Support: When services evolve, contract tests help maintain?

Short answer: compatibility between different versions of APIs. Tools: Pact (most common for consumer-driven contract testing) Spring Cloud Contract (for Java-based microservices)

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.