What is a subscription on ao3?

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Tags

1. #links
2. #subscription
3. #content
4. #archive
5. #chapters
6. #posted
7. #notifications
8. #subscribed
9. #series
10. #subscriptions
11. #contain
12. #updates
13. #receive
14. #individual
15. #track
16. #users
17. #email
18. #works