"port" is a free translation of English port, which can be considered as the exit of communication between equipment and the outside world. Ports can be divided into virtual ports and physical ports, where virtual ports refer to the ports inside the computer or the switch router.
Invisible. For example, port 80 in the computer, or port 8080 here, and so on. Physical ports, also known as interfaces, are visible ports, and RJ45 network ports on the computer backplane belong to the category of physical ports.