Multi-platform App UI (MAUI)
.NET Multi-platform App UI (.NET MAUI) is a cross-platform framework for creating native mobile and desktop apps with C# and XAML.
.NET MAUI provides a single framework for building the UIs for mobile and desktop apps. The following diagram shows a high-level view of the architecture of a .NET MAUI app:

Reference
https://docs.microsoft.com/en-us/dotnet/maui/what-is-maui