What is .NET Aspire, and how does it improve the local development and orchestration experience for cloud-native, multi-service .NET applications?

​.NET Aspire is an opinionated stack for building observable, cloud-native applications, providing a code-first orchestration model (an AppHost project defining service dependencies like databases, caches, and other services using C#) that automatically wires up service discovery, connection strings, and health checks between projects for local development, plus a built-in dashboard showing live logs, traces, and metrics across all running services -- reducing the boilerplate of manually configuring Docker Compose files or Kubernetes manifests just for local development.

// AppHost Program.cs
var builder = DistributedApplication.CreateBuilder(args);
var redis = builder.AddRedis("cache");
var db = builder.AddPostgres("postgres").AddDatabase("orders");
var api = builder.AddProject<Projects.OrderApi>("orderapi")
    .WithReference(redis)
    .WithReference(db);
builder.Build().Run();