WinUI 3 is the native UI platform component that ships with the Windows App SDK (completely decoupled from Windows SDKs). The Windows App SDK provides a unified set of APIs and tools that can be used to create production desktop apps that target Windows 10 and later, and can be published to the Microsoft Store.
Important
The Windows App SDK was previously known as Project Reunion. Some assets, such as the VSIX extension and NuGet packages, still use this code name (these will be renamed in a future release).
Windows App SDK is used in all documentation except where a specific release or asset still refers to Project Reunion.
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