What does "() =>" mean in C#?

Came across the following line in the Composite Application Guidelines.

I know the => is a lambda but what does the () mean?

What are some other examples of this?

What is it called so I can search for it?

this.regionViewRegistry.RegisterViewWithRegion(RegionNames.SelectionRegion
        , () => this.container.Resolve<EmployeesListPresenter>().View);