In WPF, what are the differences between the x:Name and Name attributes?

Question

The title says it all. Sometimes it seems that the Name and x:Name attributes are interchangeable.

So, what are the definitive differences

Answer 1

My research is x:Name as global variable. However, Name as local variable. Does that mean x:Name you can call it anywhere in your XAML file but Name is not.
Example:

You can't Binding property Content of Button with Name is "btn" because it outside StackPanel