Universal Windows Apps

UWP = Universal Windows Platform

Available from the Microsoft Store on all devices that run on Windows 10 or Windows 11

Windows 10 introduced the Universal Windows Platform (UWP), which provides a common app platform on every device that runs Windows.
The UWP core APIs are the same on all Windows devices. If your app only uses the core APIs, it will run on any Windows device no matter whether you are targeting a desktop PC, Xbox, Mixed-reality headset, and so on.

Microsoft droppign UWP

Microsoft has ceased development of UWP and has now changed to “Windows App SDK” and “Win UI” being the new platforms it recommends going forward.