Applying armature modifier?

This may be a very simple question, but I’m new to Blender and I can’t figure it out:

Why is it that the Armature modifier works perfectly as long as I don’t apply it, but as soon as I press “Apply”, only the bones keep moving but not my model? Is it something about the settings? Or is this normal behaviour? And, if so, why?

Thanks for any help!

Why do you want to apply it ?

See: http://wiki.blender.org/index.php/Doc:2.6/Manual/Modifiers/Deform/Armature

Well, I had my animations ready and working so I tried to export them to use them inside an Android project. But inside this project, the animations didn’t work anymore (at least those animations where armature is involved) so I thought it might have something to do with this…

so I tried to export them to use them inside an Android project.
What format ? Does the docs for the exporter say it exports armature animations ?