The book is dedicated to the XAML language - the central link of such modern technologies and programming tools as WPF and Xamarin.Forms. The main provisions of the XAML syntax are described and numerous examples show the capabilities of XAML mechanisms that distinguish this language from such traditional markup languages ​ ​ as, for example, HTML. In addition to XAML syntax, namespaces, keywords, and the most useful controls used to create an intuitive user interface are described.