On the Internet port often refers to a number that may be part of a URL, appearing after a colon right after the domain name. You can write our web address as http://www.xyz.com/ as our webserver is configured to sent HTTP requests on this port. Every service on an Internet server listens on a particular port number on that server. Most services have standard port numbers, e.g. Web servers normally listen on port 80. Services can also be configured to listen on non-standard ports, in which case the port number must be specified in a URL when accessing the server, so you might see a URL like http://www.some-site.com:1701/ . This shows the HTTP Server running on the non-standard port of 1701.