What is multi factor authentication MFA and give example?

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Tags

1. #received
2. #factor
3. #examples
4. #token
5. #known
6. #smartphone
7. #security
8. #authentication
9. #supplement
10. #possesses
11. #password
12. #generated
13. #authenticator
14. #multi
15. #other
16. #subset
17. #controlled