UWP, or Universal Windows Platform, is a software development platform created by Microsoft. It allows developers to create applications that can run on various Windows devices, including PCs, tablets, and Xbox consoles. UWP apps are designed to provide a consistent user experience across different screen sizes and device types. One of the key features of UWP is its ability to access a wide range of system resources and services, such as notifications, live tiles, and Cortana integration. This enables developers to build rich, interactive applications that can leverage the unique capabilities of each device while maintaining a unified codebase.