What is the importance of database per service in microservices,

Short answer: And what are the challenges? Importance: Decoupling: Each microservice manages its own data, avoiding shared database bottlenecks and promoting service independence.

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.