Configuration as Code: Store configuration settings in version control (e.g., YAML?

Short answer: or JSON files) and use tools like Helm (for Kubernetes) to manage configurations. Example: Using Spring Cloud Config Server to manage API keys, service URLs, and other configurations across development, staging, and production environments. Scaling 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.