Projections, Projections Everywhere - C++17 comes to Town

In a nutshell.

1. C++/CX ("component extensions") are extensions to C++ to create  Windows Runtime (WinRT) applications in as native a C++ style as possible
2. C++/WinRT is the recommended alternative to interacting with WinRT (available in the Windows 10 SDK from version 1803 onwards) and is C++17 language compatible
3. Projections are thee new name for bindings

Roughly speaking, WinRT is the Win32 API ported from C to C++, with a whole load of new stuff for Windows 10 and beyond.