What is Google Authorship and Author Authority?

[krishnanayak]

Hello Everyone !! What is Google Authorship and Author Authority?

[jainteq]

One of the most important features of Google Plus is its authorship system. The idea is that an author can build rank and trust (called Author Rank) based on the content they write all over the web. Google already has a way to determine your expertise at those subjects and it is only getting smarter in how it ranks authors and their content.

[luffy268]

Google Authorship was a program that allowed online authors to identify and verify their content with Google. This was accomplished by a two-way link between the author’s content across the web and his Google+ profile.

While the Authorship program was officially discontinued by Google on August 28, 2014, it is likely that Google’s interest in the value of the authority, trust, and reputation of an author in a given topical area is undiminished.

[AmarInfotech]

Google Authorship is established when you link your Google+ profile with your content. This two-way connection verifies ownership.
Author authority is the value of the content of the author in google's eye. It same as the Domain authority.