What is the host builder pattern in .NET?

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**Host builder** — standardized app startup and lifecycle. **Generic host:** ```csharp var builder = Host.CreateApplicationBuilder(args); builder.Services.AddHostedService(); builder.Services.AddDbContext(); var host = builder.Build(); await host.RunAsync(); ``` **Web host:** ```csharp var builder = WebApplication.CreateBuilder(args); builder.Services.AddControllers(); var app = builder.Build(); app.MapControllers(); app.Run(); ``` **Configuration sources (ordered by precedence):** 1. appsettings.json 2. appsettings.{Environment}.json 3. Environment variables 4. Command line arguments 5. User secrets (development) **Features:** - Dependency injection. - Configuration. - Logging. - Lifetime management. - Hosted services.

C#: What is the host builder pattern in .NET?