Xamarin.Forms
Xamarin.Forms is an open-source UI framework from Microsoft for building cross-platform mobile applications from a single shared codebase. It allows developers to create native user interfaces for iOS, Android, and Windows using C# and .NET, with XAML for defining UI layouts. The framework provides a rich set of controls and layouts that render to native platform elements, ensuring a consistent look and feel across devices.
Developers should learn Xamarin.Forms when they need to build mobile apps for multiple platforms while maximizing code reuse and leveraging existing C#/.NET skills. It is particularly useful for enterprise applications, business tools, or projects where maintaining a single codebase reduces development time and costs. Use cases include internal business apps, data-driven applications, and scenarios where sharing logic across platforms is critical, though it may be less ideal for highly customized or performance-intensive UIs compared to native development.