A hyperlink is simply a link on the web to some other resource. It uses a special kind of command that jumps you to some other content in your web browser, usually to another page.
The way to tell if something is a hyperlink is by seeing if your mouse becomes a pointing hand when hovering over it. It is also usually either displayed as blue underlined text or an image/advert. However, the appearance does not change the function.
Some website owners wish to reserve the right to not be hyperlinked without permission.
Creating a hyperlink in html:
<a href="LINK GOES HERE">TEXT GOES HERE</a>