Microsoft-owned Xamarin is a software development framework that enables programmers to build cross-platform mobile applications using C# and.NET. With Xamarin, developers can write a single codebase and use it to create native applications for Android, iOS, and Windows devices, without needing to write separate code for each platform.
If you are interested in learning more about Xamarin, then check out this video offered by Intellipaat. Upon watching this video you will get better understanding of what is Xamarin, its important features, advantages and disadvantages -