Is OAuth for authentication or authorization?

Related questions

1. What is the use of OTP?
2. What is authentication and authorization?
3. Which is least secure method of authentication?
4. What is a bank authorization?
5. Where can I find merchant identification number?
6. What is card authentication failure?
7. Why is authorization needed?
8. What is the difference between credit card authentication and authorization?
9. How secure are JWTs?
10. Is authentication required for authorization?

Tags

1. #providers
2. #another
3. #consumers
4. #password
5. #share
6. #doesn
7. #without
8. #approve
9. #between
10. #prove
11. #authentication
12. #instead
13. #protocol
14. #service
15. #allows
16. #oauth
17. #interacting
18. #giving
19. #tokens
20. #authorization
21. #identity
22. #application
23. #behalf