Xamarin is a cross-platform app development tool that allows developers to use C# for creating iOS, Android and Universal Windows apps. The XAML-based framework allows interface design for all 3 platforms to be created in one place. Xamarin is the answer to most developers’ dilemmas when they are coding an app for different platforms since each has their own coding languages and UI conventions.
Xamarin is used in the development of cross-platform apps. It is a highly preferred tool since the native UI remains, access to specific-device features is available, and most of all, offers performance comparable with native apps. Sharing code over platforms becomes easy with Xamarin, helping you reduce the overall app development cycle.