Google Hangouts is a conferencing tool that offers video, audio, chat, and screen sharing between participants. Access to Hangouts comes with your CSS Gmail account.
Google Hangouts On Air with YouTube Live is an additional feature of Hangouts that you can use to broadcast your Hangout live using YouTube and create a recording that can be viewed later.
Hangouts is a convenient and easy-to-use tool for these kinds of activities:
Student group collaboration
Conferences / faculty office hours
Collaboration with colleagues
Record a video conference session for viewing to watch later
Broadcast a video conferencing session through YouTube.