Initially launched in 2011, Xamarin is a dev toolkit that lets developers develop native Android, iOS, and Windows apps with unified and branded user interfaces. This cross-platform app toolkit utilizes the Mono framework for effective communication with the API of common mobile device functions and uses a shared code to build usability and compatibility across various operating systems.
For developers, Xamarin is a seamless transition, as it lets them develop powerful apps using the C# programming language that needs the .NET CLI (Common Language Infrastructure). Read more: Pros and Cons Xamarin Development: A Detailed Analysis of the Frameworks