BAML (Binary XAML) is compiled XAML file in WPF.
The Binary Application Markup Language is a file format of Microsoft that is generated by compiling XAML files.
A XAML file can be compiled into a Binary Application Markup Language file having the .BAML extension, which may be inserted as a resource into a .NET Framework assembly. At run-time, the framework engine extracts the .BAML file from assembly resources, parses it, and creates a corresponding WPF visual tree or workflow. Having this format, the content is faster to load during runtime.