.NET Aspire (introduced in .NET 8/9) is an opinionated stack for building cloud-native distributed applications. It gives you built-in service discovery, health checks, telemetry, and a developer dashboard out of the box. With Aspire, you define your entire app — Redis, SQL Server, APIs, workers — in a single AppHost project using C# code. No YAML, no Docker Compose headaches. The dashboard shows live logs, traces, and metrics during development. It integrates seamlessly with Azure and supports OpenTelemetry by default. This is the future of .NET cloud development.