How does scaling work in Azure App Service?

Short answer: Vertical scaling: Increase instance size (CPU, memory). Horizontal scaling: Add more instances (scale out). Autoscaling: Automatically adjust instances based on metrics like CPU usage.

Real-world example (ShopNest)

ShopNest’s API runs on Azure App Service with staging slots—swap staging to production after smoke tests.

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.