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This content is part of the Essential Guide: Secure Web gateways, from evaluation to sealed deal
Definition

port 80

On a Web server or Hypertext Transfer Protocol daemon, port 80 is the port that the server "listens to" or expects to receive from a Web client, assuming that the default was taken when the server was configured or set up. A port can be specified in the range from 0-65536 on the NCSA server. However, the server administrator configures the server so that only one port number can be recognized. By default, the port number for a Web server is 80. Experimental services may sometimes be run at port 8080.

This was last updated in April 2005

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This definition seems a little weak.  To understand ports you need to understand protocols.  HTTP is a protocol for Hypertext Transfer.  It expects unencrypted hypertext that the webserver can then serve to a web browser over port 80, but it could come over other ports, if the server is configured to listen for them.  

 Encryptted HTTP Traffic may be over other ports like 443 for HTTPS SSL/TLS.   You can see list of some common ports here:  http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers


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