What is the role of Startup class now with newer versions of .NET vs minimal hosting model?

Short answer: In .NET 5 and earlier, Startup configures services and middleware. In .NET 6+ minimal hosting model, the Program.cs file combines service registration and middleware setup with a simplified, top-level statement style. Startup can still be used for organization, but not required.

Real-world example (ShopNest)

A ShopNest checkout request flows through middleware, hits a minimal API or controller, uses scoped services, and returns ProblemDetails on errors.

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.