What is a deployment slot in Azure App Service?

Short answer: A deployment slot is a separate environment for your App Service, e.g., staging, testing, QA, or production. Each slot runs as a full App Service instance with its own hostname, configuration, and settings. Enables zero-downtime deployments by swapping slots.

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.