What is Google Authorship? Google Authorship is the link between your Google+ profile and the content you create. Why would you want to set it up?
One of the biggest benefits of using Google+ is the ability to claim ownership of the content you create by linking it to your profile. The feature is called Google Authorship.
If you are looking for a clear and thorough guide on the topic, check out the article Martin Shervington has written for Plus Your Business. He explains:
The benefits of using AuthorshipHow to set it upThe difference between ‘rel=author’ and ‘rel=publisher’
The article also features an interview with Google+ expert Mark Traphagen, and a quizz. All in all, a must-read!