Universal Windows Platform apps

Khan Academy, an example of a Metro-style app
Left: A traditional desktop app without contents; it is showing 60 graphical widgets, and a thick border.
Right: Metro-style app; entirely composed of contents

Universal Windows Platform (UWP) apps (formerly named Windows Store apps, Metro-style apps and Modern apps) are applications that are built on the Universal Windows Platform. They are primarily purchased and downloaded via the Microsoft Store, Microsoft's digital application storefront and can be used across all compatible Microsoft Windows devices since Windows 8. UWP stopped most new feature development in October 2021, but toolchain and other updates continue to be made.