Areas

Areas are an ASP.NET feature used to organize related functionality into a group as a separate namespace (for routing) and folder structure (for views). Using areas creates a hierarchy for the purpose of routing by adding another route parameter, area, to controller and action or a Razor Page page.

Controllers decorated with the [Area] attribute to associate the controller with the area:

[Area("Products")]
public class ManageController : Controller
{

The area route added to startup:

app.UseMvc(routes =>
{
    routes.MapRoute(
      name: "MyArea",
      template: "{area:exists}/{controller=Home}/{action=Index}/{id?}");

    routes.MapRoute(
       name: "default",
       template: "{controller=Home}/{action=Index}/{id?}");
});