Google+ is a service to share photos, links, as well as other content. The Google Plus application programming interface is the programming interface to Google Plus which allows developers to access publicly available Google+ content, comprising user information and publicly shared items.
In other words, it allows developers to fetch public data from Google Plus. It enables users to connect with each other for maximum engagement using Google Plus features from within your application.
It offers you an excellent opportunity to write about your business.
You can easily find people based on particular interest with Google’s search features.
It allows you to share valuable content with a link back to your site.