The ASP.NET Core Module is a native IIS module that plugs in

host an ASP.NET Code app inside of the IIS worker process, called the out-of-process hosting model, or forward web requests to a backend ASP.NET Core app running the Kesrel server, called the in-process hosting model
create IIS code the server needs in a file with the extension required, or run the IIS server in a mode compatible for ASP.NET Core
package up your C# application and C# packages into .NET modules, or specify which of its packages should be visible to other .NET modules
host an ASP.NET Code app inside of the IIS workes process, called the in-process hosting model, or forward web requests to a backend ASP.NET Core app running the Kestrel server, called the out-of-process hosting model

The ASP.NET Core Module is a native IIS module that plugs into the IIS pipeline to either _.