.NET 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 Essentials arrives this fall 2021. Alongside more details of MAUI, Microsoft says it will end updates to the Xamarin mobile app development platform in November 2022. Xamarin has been the Microsoft technology for developers to use if they want to develop apps for iOS and Android using C#.

Sources:

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