Google+ is a social networking service from Google. Google+ allows transparency in who you share with and how you interact. It integrates all Google services and displays a new Google+ menu bar on other Google services when you're logged into a Google account. Google+ makes use of the Google search engine, Google Profiles, and the +1 button.

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(Source: https://www.lifewire.com/what-is-google-definition-1616721)