Thread:Manual talk:Pywikibot/Difference between link and refer

I am trying to localise the messages Pywikibot:Delete-referring-pages ("Robot: Deleting all pages referring from %(page)s") and Pywikibot:Delete-linked-pages ("Robot: Deleting all pages linked from %(page)s") at translatewiki.net. Apparently the documentation at delete.py states:
 * -links:     Delete all pages linked from a given page.
 * -ref:       Delete all pages referring from a given page.

Can someone please explain the difference between "link" and "refer"?