Logging: built-in logging, third party (Serilog, NLog)?

Short answer: ASP.NET Core has built-in logging with providers (Console, Debug, EventSource). Third-party libs like Serilog and NLog offer rich sinks, structured logging. Configure logging via appsettings.json or code.

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.