Google makes use of the Authorship as a Ranking Signal as well as intends to writing the web content using authorship markup. The fact is this feature also campaigns the Google Profile, to improve the Google+ user experience.
Few words from the statements of Google,
Here are the basic steps:
1. Find your Google Profile
2. Add “?rel=author” on the end of your Google Profile URL
3. Wrap that in an a tag – <a href=”that url here”
4. Google wants you to use something like “+Matt Cutts” as the anchor text.5. Insert that on your article, and point your Google Profile back to the site
“If I can’t control the attributes, I can still add a link to this special URL,” says Cutts, and it’s really as simple as that.