A link which shows the full URL of the page being linked at. Some links only show relative link paths instead of having the entire reference URL within the a href tag. Due to canonicalization and hijacking related issues it is typically preferred to use absolute links over relative links.
Example absolute link
<a href=”http://seobook.com/folder/filename.html“>Cool Stuff</a>
Example relative link
<a href=”../folder/filename.html“>Cool Stuff</a>