What is the difference between Hangouts and Hangouts dialer?

Related questions

1. Does Google Hangouts require a phone number?
2. Does Hangouts show on phone bill?
3. Does Google Hangouts have a phone number?
4. Can Messenger calls be traced?
5. Can Google Hangouts receive calls?
6. Is Google Voice and Hangouts the same?
7. Does Google Hangout call cost?
8. Do hangouts calls show on phone bill?
9. Are Google Voice numbers Anonymous?
10. Do I need Google Voice and Hangouts?

Tags

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2. #numbers
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4. #allows
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6. #phone
7. #chargeable
8. #canada
9. #other
10. #however
11. #called
12. #forwarded
13. #within
14. #dialer
15. #hangouts
16. #calls
17. #voice
18. #users