What are deployment slots in App Service?

Short answer: Deployment slots are separate environments (like staging or testing) within the same App Service. You can deploy new versions to staging before swapping to production.

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.