What does archive mean?

Your document archive is a place for you to put documents that you don't use very often but that you don't want to delete for good. 

Old letters, outdated transcripts, and any other documents can all be archived.

How do I archive a document?

 To archive a document, check the box to the left of the document and click "Archive." 

When you archive a document, the document won't be displayed when you initially go to the "My Documents" screen. To view archived documents, simply check the box next to the word "Archive" toward the top of the page.