When you add a graphic to a document, you can either plop it straight in so it's stored in the document, or you can link the graphic so that the document just points to where the graphic is stored.
It looks the same either way, but here's the thing. When you email your document to someone, or post your template in a network directory, what happens to that link pointing to the graphic?
The link points back to your directory at
home\documentdrafts\2008\graphics\teamphoto.gif or whatever the path is. And your cousin in Phoenix or the other people on your team can't get to that graphic.
So what you want to do, typically, when you're sending documents or templates to other people that those people need to work with, is to make sure that your graphics are embedded in your document.