How do you secure a .NET app using Azure AD?

Short answer: Use Microsoft.Identity.Web for ASP.NET Core. Configure authentication in Program.cs: builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationS cheme) .AddMicrosoftIdentityWebApi(builder.Configuration.GetSection("AzureA d")); app.UseAuthentication(); app.UseAuthorization(); Tokens from Azure AD validate API requests.

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.