How DOI works?

A unique identifier will be added to a published paper. They are unique worldwide. DOI allows published papers to be identified and accessed with certainty. Once DOIs are allocated, they never change.

 

What are the direct benefits of the author?

DOI surely adds value to any published paper. It is a globally recognized system. It increases the visibility of the published paper. An author can also add DOI in their resume/CV with the particular publication details.