Hangouts are free video conferencing calls with up to 10 people, done through the Google+ website or mobile app. Many apps can be used inside the hangout, allowing users to share documents, a scratchpad or their screens with other users. As well as many built-in apps such as YouTube, Google Docs, and the new Capture. 3rd Party apps built using the Hangout API are also available
Hangouts On-Air gives users the ability to create instant webcasts over Google+. The broadcasts can also be recorded for later retrieval.