Hello @Kamyar koushki ,
Welcome to our Microsoft Q&A platform!
In .NET 6, the new .NET Multi-platform App UI (MAUI) will be announced. .NET MAUI is the evolution of Xamarin.Forms, a cross-platform mobile first framework for Android, iOS, and UWP. You could think of this as the next major version of the same product you know today. Don't warry about the 'obsolete' problem. Xamarin.Forms will continue to receive service releases through November 2022.
For more details, you could refer to this documentation: https://devblogs.microsoft.com/xamarin/the-new-net-multi-platform-app-ui-maui/
Best Regards,
Jarvan Zhang
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