Here are some interesting facts compiled about Hangouts from Google+ Help
How is it useful?
Go live from your laptop
Now live broadcasts are only a few clicks away. Stream your hangout publicly on your Google+ profile, your YouTube channel, and your website.
Save instantly to YouTube
You don’t need special software to record your conversation. Every Hangout On Air is automatically saved to your YouTube account.
Share to the world
Edit and share the recorded hangout. Once your hangout is over, it’s easy to keep the conversation going. Your hangout video is shared publicly on Google+ and on your YouTube channel. You can reshare this video just like any other.
How it works:
Start a hangout
Start a hangout and invite specific people or Google+ circles to join you. Then name your hangout.
Enable Hangouts On Air
Check “Enable Hangouts On Air”. The first time you do this, you will need to agree to the Terms of Service and also link your YouTube account. Learn more
Start your broadcast
Click “Start broadcast” to go on air. After a five-second countdown, your hangout will start broadcasting to the public on your Google+ profile, your YouTube channel, and on any website where you’ve embedded it. Recording starts when broadcasting starts.
The below video explains it.
You can check the Live Hangouts on the Hangouts Home page
Edit and Publish your Hangout On Air
To make changes to your video, try YouTube’s video editor.
For videos longer than two hours, you’ll need to download, edit, and then upload the videos again to your YouTube channel. Learn more about how to download your video.
Stay tuned to know how you can Google+ Hangout for your business!