Before you know port 443, you must know what port is in computer language and why it is numbered. In computer networks, port numbers represent communication endpoints. Provide a port number to identify the forwarding process of network messages or data when they arrive at the server. It is a 16-bit integer appended to the header of the message unit.

There are many types of network ports that are virtual and have serial numbers, such as port 20, port 2 1, port 80, port 443, port 465 and so on. Computer networks use different ports to transmit different types of traffic to destinations. Port 443 is explicitly used for HTTPS service, so it is the standard port for HTTPS (encrypted) traffic. It is also called HTTPS port 443, so all protected transactions are conducted using port 443.