Rel Publisher Definition
About SEO > Rel Publisher
Rel Publisher is a Meta tag that connects your Google+ page to a website. This allows you to list your business’ website as the publisher of content related to your Google+ page. With the Publisher designation you can have your website’s content show in the SERPs with your business’ image (e.g. logo) and links to your Google+ page and related content including reviews.
It is best to make sure that as a business you use the Publisher tag as opposed to the Author tag except where you wish to link certain specific content that has an author. The Publisher tag is great for businesses to connect their social presence in Google+ to their site which can help to increase click-throughs as you are providing more information for them to consider.