What is Application Insights?

Short answer: Application Insights is an APM (Application Performance Monitoring) service. Tracks requests, dependencies, exceptions, page views, and telemetry for .NET apps. Example – Integrating with ASP.NET Core: builder.Services.AddApplicationInsightsTelemetry(builder.Configurati on["APPINSIGHTS_INSTRUMENTATIONKEY"]);

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.