What is Absolute Link?
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 canonical and hijacking related issues it is typically preferred to use absolute links over relative links.
Example absolute link
<a href="http://www.webtoolhub.com/dir/file.php">Click here</a>
Example relative link
<a href="../dir/file.php">Click here</a>