XAML stands for eXtensible Application Markup Language is the declarative markup language follows the XML rule and is used for developing User Interface in WPF and Silverlight technology. XAML files are XML files that generally have the .xaml extension and then separate the UI definition from the run-time logic by using code-behind files, joined to the markup through partial class definitions.

XAML has a set of rules that map object elements into classes or structures, attributes into properties or events, and XML namespaces to CLR namespaces. XAML elements map to Microsoft .NET types as defined in referenced assemblies, and the attributes map to members of those types.