What is the port number for HTTPS?

Port numbers are crucial for network communication, identifying specific processes or services on a network device. HTTPS (Hypertext Transfer Protocol Secure) is the secure version of HTTP, which uses SSL/TLS encryption to protect data exchanged between a web browser and a server. The default port number for HTTPS is 443.

• 80 (A) is incorrect; this is the default port for standard, unencrypted HTTP traffic.
• 21 (B) is incorrect; this is the default port for FTP (File Transfer Protocol), used for transferring files between a client and server.
• 25 (D) is incorrect; this is the default port for SMTP (Simple Mail Transfer Protocol), which is used for sending email.

Using port 443 for HTTPS ensures that web traffic is encrypted, providing confidentiality and integrity for sensitive information like login credentials and financial transactions.