What is an alpha layer in Photoshop?

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Tags

1. #image
2. #separate
3. #create
4. #determines
5. #certain
6. #transparency
7. #control
8. #green
9. #photoshop
10. #isolate
11. #essentially
12. #selections
13. #settings
14. #addition
15. #channel
16. #object
17. #alpha
18. #channels
19. #component
20. #colors
21. #opacity