What are Google Hangouts? They are video calls with up to 10 people on a standard account and 15 people on an Google Apps account, and also text chat with up to 100 people; as well as live events streamed on YouTube, and conference calls too.
Via Neil Ferree
Arguably, one of the most useful features of Google+ platform is the Google Hangout app. I use Hangouts every time I coach a new client on How to Build a Content Marketing System.