Port 80 is the standard port used by web browsers to connect to web servers using HTTP, which is unencrypted. By configuring the firewall to permit traffic on this port, internet users can access the web server's content without encryption. Other ports are used for different protocols or encrypted web traffic: Port 443, for example, is used for HTTPS, which is the secure version of HTTP, and Port 8080 often serves as an alternate to port 80, especially for proxy servers or secondary web servers. Port 53 is primarily used for DNS services, not HTTP traffic.