Normally, whenever you access a website, it is running on port 80 or 443. Any normal HTTP request travels over port 80, and the encrypted HTTPS uses port 443. Inside IIS, it is very easy to change the port that a website is listening on if you need to do so. Probably the most common reason to institute a port change on a website is to keep it hidden. Maybe you have an administrative site of some kind and want to make sure that nobody stumbles across it, or perhaps your web server is limited on IP addresses, and you need to turn on another web page but all of your IPs are already running sites. You could utilize a different port for the new site and then have the opportunity to run two (or more) sites using the same IP address, one site on each port.
Whatever your reason for wanting to change the port that a website runs on, let's walk through the steps to accomplish this task so that it can be one more tool added to your belt.