First of all XAML is a language. Second of all Microsoft is now avoiding saying WinRT explicitly, for example: http://msdn.microsoft.com/en-US/library/windows/a

First of all XAML is a language. Second of all Microsoft is now avoiding saying WinRT explicitly, for example: http://msdn.microsoft.com/en-US/library/windows/apps/hh872190.aspx http://msdn.microsoft.com/en-US/library/windows/apps/hh87219.... Third of all "set of available UI components" kind of matters when you are building certain LOBs.