There are four different Universal app project templates that ship with Visual Studio 2015: Blank App, Hub App, Class Library, and Windows RunTime Component.
The Blank App is self-explanatory. It creates blank phone and Windows pages for you without any predefined layout or control set. The Hub App is used to create multilevel hub-type user experiences where multiple items can be grouped in different ways, and drilling down on an item will allow you to view the item detail. This is similar to the approach we adopted with the XAML Image Viewer app. Class Library is also self- explanatory; it is meant for creating a standard
.dll/class library with no UI components.
Finally, the Windows Runtime Component template allows ...