What is a common port number for HTTP traffic?

HTTP traffic commonly uses port number 80. This is the default port for the Hypertext Transfer Protocol, which is the foundation of data communication on the World Wide Web. When a user enters a web address in their browser without specifying a port, the browser automatically connects to port 80 for HTTP requests. This standardization allows different web servers and clients to communicate seamlessly.

Ports 443, 22, and 25 serve different purposes. Port 443 is reserved for HTTPS traffic, which adds a layer of security to HTTP through encryption. Port 22 is typically used for SSH (Secure Shell), a protocol that facilitates secure remote access. Port 25 is primarily utilized for SMTP (Simple Mail Transfer Protocol), which is used for sending emails. The designation of port 80 specifically for HTTP is what makes it the appropriate choice for this question.