Hangouts let users connect and communicate with colleagues in multi-user video rooms. Users might use Hangouts to hold a business meeting, discuss a particular "hot topic" or pressing issue, or just have a multi-user video chat.
Hangouts let you share your computer screen so other people in the hangout can see what’s on your screen. You can choose to share any open window on your computer. You can also share Google Drive files and collaborate to write meeting notes or draw on a shared whiteboard.
In addition, Google+ Hangouts are integrated with Google Calendar. Users can add hangouts to their calendar events and join hangouts directly from the calendar event or event reminder.
When you start a hangout in Google+, you'll also see an option to use Hangouts On Air. Hangouts On Air let you broadcast your hangout, making them a great option for large presentations, demonstrations, or lectures. After the hangout and live broadcast, you can edit the recording of the meeting and share it on YouTube.