Can't be opened because it is from an unidentified developer in Mac?

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Tags

1. #action
2. #appear
3. #click
4. #applications
5. #these
6. #developer
7. #because
8. #control
9. #application
10. #opened
11. #choose
12. #asking
13. #contextual
14. #unidentified
15. #confirm
16. #mountain
17. #instructions
18. #popup