What does stalled mean on Qbittorrent?

Related questions

1. Why is my download speed good but my upload speed is bad?
2. Why is my downloading so slow?
3. Does upload speed help gaming?
4. Whats a good upload speed?
5. How do I reset my qBittorrent?
6. Is Qbittorrent open source?
7. Why is my WIFI so slow all of a sudden?
8. What if my upload speed is slow?
9. Why is my upload speed so slow?
10. What affects upload speed?

Tags

1. #limit
2. #observed
3. #connected
4. #their
5. #different
6. #number
7. #because
8. #peers
9. #which
10. #stalled
11. #afaik
12. #download
13. #usually
14. #torrent
15. #often
16. #status
17. #reasons
18. #programs
19. #wants