How do you make a color transparent in Photoshop?

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Tags

1. #shift
2. #photoshop
3. #additional
4. #selected
5. #selection
6. #image
7. #transparent
8. #change
9. #areas
10. #magic
11. #expand
12. #background
13. #select
14. #using
15. #entire
16. #click
17. #color