A common question in the SEO space is should I use absolute or relative URLs. Absolute URLs are when you link a URL by using the domain.com portion as well, so linking to my authors page would be a link like https://www.seroundtable.com/authors.php. The relative URL for that authors page would be a link like /authors.php.
As you can imagine, there are pros and cons. JohnMu, a Googler, has an outstanding post in a Google Groups thread with sage advice. It would be a crime if I did not quote the whole post, so here it is:
Solid advice!
Forum discussion at Google Groups.
This post was written on June 5th and schedule to go live today.