What is the use of port 20 and 21?

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Tags

  1. #session
  2. #authority
  3. #server
  4. #client
  5. #connections
  6. #during
  7. #created
  8. #connection
  9. #being
  10. #second
  11. #protocol
  12. #first
  13. #between
  14. #description
  15. #internet