Xamarin.Forms introduces three additional project templates for you to choose from. At the time of writing this, these templates are only available in C# format:
Blank App (Xamarin.Forms Portable): This template will create a blank application based on PCL. In Chapter 4, Plugins, Templates, Libraries, and Files, we learned that PCL allows you to share code across multiple platforms and any refactoring will update all references. PCL, however, lacks support for preprocessor directives, and only a subset of .NET functions are available.
Blank App (Xamarin.Forms Shared): This template will create a blank application based on the shared project paradigm. Shared projects can utilize preprocessor directives and can contain platform-specific references while remaining usable across all platforms. Although shared projects have no output type, that's not a problem in this context since the solution must also contain a platform-specific project for whichever platform...