Multi-AZ or Multi-Region Deployment:?

Short answer: In cloud environments, deploy services across multiple availability zones (AZs) or even regions to avoid single points of failure.

Example code

In Kubernetes, you can use ReplicaSets to ensure that multiple instances of a service are always available, and Horizontal Pod Autoscaling (HPA) to automatically scale the number of pods based on metrics like CPU or memory usage. Testing 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.