Why would you need to shorten a URL or website address? There are a few reasons why but two important reasons would be:
1. When sharing a URL or address for a website in a post or an email it is easier to share a shortened version.
2.When Tweeting you are only allowed 140 characters and so a shortened URL will allow you to share more information.
Google URL Shortener is a great tool that will not only help you shorten your URL but it will give you a FREE QR Code for that URL.
Here is a demonstration of how to use this great tool: