What is the difference between Classic and YAML pipelines?

Short answer: Feature Classic Pipeline YAML Pipeline Definition GUI-based Code-based (in repo) Versioning Manual Versioned with code CI/CD Supported Supported, recommended Reusability Limited High

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.