links or (Document relative) have the advantage
of being shorter, and more portable as they refer
to other pages relative to themselves.
For example- ../logos.html refers to a file named
logos on level above the current page.
links are sometimes called document- or site-root
relative as absolute links, for some, refer to entire
the different names for this kind of link, the logic
is the same, both are based on the named directory
structure of site.
Absolute links can get quite long.
If the site has a basic hierarchical structure, relative
links are the best choice. Complex sites, or those
with dynamically generated pages (like this one),
are usually best served by absolute links.