What are the advantages in using xamarin for development?

They can deliver native iOS, Windows, and Android apps using existing skills, teams, and code(C# XAML).

• With Xamarin technology one can take full advantage of Native APIs. Native controls and behaviors can be mapped with Xamarin.Form elements.
• The app store of Xamarian allows the addition of high-quality components to the app directly from the IDE, including controls, web service API and more.
• Features like PCL/Shared make it very easy for the app developers to share the same code base throughout various projects.