What is recall message in WeChat?

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Tags

1. #happened
2. #select
3. #press
4. #upgraded
5. #announcing
6. #android
7. #wechat
8. #parties
9. #feature
10. #arrow
11. #recall
12. #minutes
13. #would
14. #instantly
15. #within
16. #never
17. #message
18. #unsend
19. #right