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XAML, or Extensible Application Markup Language, is a declarative markup language developed by Microsoft for creating user interfaces (UIs) in applications on the .NET platform. Similar to HTML for web pages, XAML uses a hierarchical structure of elements and attributes to define and customize UI components, graphics, animations, and data bindings.

Key characteristics

Declarative language: You use XAML to declare what the UI should look like, not how to build it. For example, Button Content="Click Me"/ declares a button with the text "Click Me," rather than writing procedural code to construct one.

XML-based: XAML is fundamentally based on XML and uses a structured tag syntax. All valid XAML is also valid XML.

Separation of concerns: A core benefit of XAML is that it separates the UI's visual design from the application's underlying code or business logic. A XAML file (.xaml) defines the UI, while a "code-behind" file (e.g., .cs for C#) handles the events and logic. This separation makes it easier for designers and developers to work on the same project simultaneously.

Object instantiation: XAML elements correspond directly to instances of .NET objects. When a XAML file is parsed, the elements are used to create objects in memory and set their properties.