What is the difference between Azure PaaS, IaaS, and SaaS?

Short answer: Model Description Example for .NET IaaS (Infrastructure) Provides virtual machines, networking, storage Azure VM running Windows + IIS hosting ASP.NET app PaaS (Platform) Managed hosting environment for apps Azure App Service, Azure Functions SaaS (Software) Fully managed software accessible via browser Office 365, Dynamics 365

Real-world example (ShopNest)

ShopNest on Azure typically uses App Service + SQL Database + Blob Storage + Application Insights for monitoring.

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.