Creating Trackable links gives you the ability to take an URL that you want to send to a contact and track when then click that link. What you do is take the full URL of the page you want and add it to the trackable links area. Then you select the tag you wish to have applied when the link is clicked. Once you have that saved you can select the trackable links option when creating a message and choose your link. This will add our trackable link for that URL to the message.
Now watch as you can now track who is clicking your links.