"Any screen can be your PC": Microsoft's Continuum for phones transforms your phone into a desktop PC
Simply put, it allows your smartphone to launch the 'big-screen' version of the UI of the Continuum-optimized app that you're running on your phone, boosting the levels of productivity or entertainment you're getting from it. In the demo, Joe Belfiore displayed a smartphone's home screen to an external monitor, and then went on to launch Office. Interestingly enough, Office appeared in a form that's very reminiscent of its desktop version on the external monitor, kind of making the Windows phone it was running from seem like a neat, little PC of sorts. Obviously, such kind of desktop-grade UI would be way more comfortable to work on, compared to the limited, touch-optimized experience on the phone's little screen.
The future of Windows looks more unified than ever and it can't come any sooner.