TCP port 443 is primarily used for which type of connection?

TCP port 443 is primarily associated with secure web browsing. It is the default port used by HTTPS (Hypertext Transfer Protocol Secure), which is an extension of HTTP. HTTPS is designed to provide a secure communication channel over the internet by encrypting the data transmitted between a user's web browser and the website's server. This encryption ensures that sensitive information, such as passwords and credit card numbers, remains confidential during transmission, protecting it from eavesdropping or tampering.

While other typical services like plain text data transfer (HTTP uses port 80), email sending (which typically uses ports 25, 465, or 587), and file transfer (often using FTP on ports 21 or 22) are important, they operate on different ports and protocols. Port 443 is specifically reserved for secure transactions related to web browsing, highlighting the importance of cybersecurity in modern internet communications.