How does app store work?

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Tags

1. #device
2. #desktop
3. #allows
4. #store
5. #download
6. #purchase
7. #through
8. #either
9. #software
10. #itunes
11. #their
12. #directly
13. #completed
14. #computer
15. #purchasing
16. #users
17. #necessary
18. #service