What is the use of Hangout app?

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Tags

1. #gmail
2. #built
3. #unified
4. #participate
5. #google
6. #chats
7. #video
8. #android
9. #hangouts
10. #either
11. #devices
12. #group
13. #voice
14. #initiate
15. #members
16. #available
17. #service
18. #allows
19. #mobile
20. #communications