● Say more with photos and emoji.
● See when people are together in Hangouts, when they’re typing, or whether they’ve seen your message.
● Turn any conversation into a video call with up to 10 friends.
● Message friends anytime, even if they're not connected right now.
● Use Hangouts on computers, Android and Apple devices.
More Hangouts awesomeness:
● Hangouts stay in sync across devices so you can start or continue them anywhere.
● Choose from hundreds of emoji to help you make your point
● See what you talked about in the past, including shared photos and your video call history.
● Get notifications just once. Once you see an alert, you won’t see repeats on your computer or other Android devices.
● View collections of photos shared from each of your Hangouts.
● Snooze notifications at times when you’d prefer to be undisturbed by alerts.
● Unlike Google Talk, Hangouts does not support "invisible" status.