Rel=”author” is a snippet of code which links the Google+ profile of an author to his or her created content. This tag is here to make the web less anonymous, – said Googler Matt Cutts, when they introduced the tag.
1. You should use this tag (well, we hope you already do) to make your articles more outstanding in the SERPs. Additionally, visitors may click the byline and see more of the author’s articles and follow him or her on Google+.