Absolute links point to a specific point on the Internet.
They are in the familiar URL form used to tell WWW browsers where to go. Any where a link to this URL is put, it will point to this document, and only this document. If this document were to move, all the links which point to it would have to be changed. So, if a document has a link to a file on the same server, the link can and should be a relative link. Relative links allow a set of Web documents to be portable across different sites, since no matter where the set is, the links are defined relative to the documents.