Asked this question:
https://superuser.com/questions/1565766/difference-between-a-serial-and-a-usb-port
a few days back and it got closed because "Closed. This question needs details or clarity. It is not currently accepting answers."
It's obvious that, from the user's contributions so far, he does not have the technical know-how to answer the question. As such, he shouldn't have any say in closing the question (or any other of the kind). Kindly, reopen it.