Port 443 is a virtual point through which data transmissions are sent and received. It is a communication endpoint used by transport layer protocols, like the Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), to direct traffic to the right places. Port 443 is used explicitly for HTTPS (encrypted) traffic and is the standard port for HTTPS services. HTTPS over port 443 is used for the transmission of secured traffic, thus creating a secure communication channel between the client browser and the server it wants to connect to. This encryption also prevents eavesdropping and intercepting communication between the browser and the websites server. Port 443 is used to secure communication travels between the client and the server. Over 95% of secured websites use HTTPS via port 443 for secure data transfer.