Pose Matrix

Hi,

I'm relatively new to VuForia and Android dev in general, but I have an image target that VuForia tracks appropriately.  Then, I get the position matrix.  What I can't seem to understand, though, is what does the translation vector of the pose matrix mean?  Also, it looks like the translation vector is affected by how the camera is pointed relative to the target; if it's straight on, it's different than if the target is not in the center of the view.  Anyway, a simplified explanation of the pose matrix would be greatly appreciated!

Thanks in advance!