What does export RSS feeds to an OPML file mean?

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Tags

1. #between
2. #known
3. #attachment
4. #exporting
5. #share
6. #delivered
7. #computers
8. #about
9. #content
10. #message
11. #subscribers
12. #mechanism
13. #someone
14. #sending
15. #feeds
16. #extension
17. #transferring
18. #collection