Xamarin.Forms is a Microsoft product allowing the building of native cross-platform apps for iOS, Android, UWP and macOS from a single sharing C# strategy as Shared Project, PCL (Portable Class Library) or .Net Standard and even a single user interface coding.

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Xamarin.Forms is a library that contains abstractions of typical UI controls that comprise your app's UI. When these controls are used on the specific platforms, they are mapped to render native UI controls so that you get the look and feel of native components.