An absolute link is an internal link that displays the full URL as opposed to a relative link that displays only the relations between the current URL and the linked URL.
For example:
An absolute link:
<a href=”http://www.nekuda.co.il/en/seo-search-engine-optimization“>SEO</a>
A relative link:
<a href=”… en/seo-search-engine-optimization“>SEO</a>
In SEO, it is generally recommended to prefer an internal link.