Hyper links or URL's are important to navigate through your website. Links take your website's visitors from page to page. URL's are also used to show images, or documents (pdf, docx, etc,) can be 'downloaded' when the link to a file is clicked. Further we use links to visit other websites (pages) and to open up your Outlook in order to use an email address.
For the purpose of the following tutorials, hyper links part 1 and hyper links part 2, we will keep it simple and create links for our own website, links to other websites (external links) and links to an uploaded pdf document (for downloading).
If this all still appears a little wary, please see the videos.