What does Google Plus (Google+) mean?
Google Plus (Google+ or just G+) is a social network built over Web 2.0 standards and specification owned and operated by Google Inc.
Google Plus is the fourth social product by Google after Google Buzz, Orkut and Google Friend Connect. It was launched in June 2011 and received a lot of hype as a viable competitor to Facebook.
Techopedia explains Google Plus (Google+)
Google Plus social network provides the services and capabilities of a typical social network along with some unique features related to Google search. Most notable is users' ability to +1 content, which can boost a page's rank, at least for those who are connected to the person who promoted it.
Google Circle enables you to sort your contacts in custom circles or groups for easy sharing. Hangouts is another key feature that enables 10 users to simultaneously conduct video chat. Google Plus is also available and compatible with most mobile platforms including iPhone, Android and Windows Phone.