What Exactly is XAML?

I found this article in the blog of the XAML Chick, it explains what does XAML mean and gives us an overview about it.

"The correct spelling is XAML, which stands for eXtensible Application Markup Language (pronounced "Zammel"). One of Longhorn's most interesting technologies for developers is this new XML-based markup language. XAML is a declarative XML-based language designed originally for Avalon (i.e.Windows Presentation Foundation WPF)."

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