XAML (pronounced zammel) is an acronym for eXtensible Application Markup Language and is an XML-based specification for defining UI Although XAML was created specifically for WPF. This is technically called a declarative programming model. WPF will take that definition and convert it into real elements on the screen.

For Example:

        //XAML Code  
 <Page
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
 <StackPanel>
 <Label>MindStick</Label>
 </StackPanel>
 </Page>

 

XAML documents are strict XML. Every tag (for example, StackPanel or Label) and attribute (for example, Margin or FontSize) must correspond to a valid .NET type or property. If a tag has the wrong case or an unknown attribute is used, the resulting XAML won’t work.