A link lets you transfer the reader to someplace else. That someplace else can be a file local to where the current page is, it can be another website, or it can be someplace within a web page, such as the current page.

A link is called an ANCHOR (heaven knows why). There are 3 parts to an Anchor: The start, <A ...>, the thing the viewer clicks on, and the </A>, which marks the end of the part the viewer clicks on.

Note that I said "the thing" the viewer clicks on. I didn't say "the text" the user clicks on. While it is usually text, it really can be anything, including an image.

The following line has you click on text to go to a URL:
If you click here, you will go to the SETI At Home project at UCBerkeley.

The anchor for the line above is:
<a href="http://setiathome.ssl.berkeley.edu/"> SETI At Home project </a>

The following line will transfer you to sample web page that is the "basic" page:
If you click here, you will go to the "basic" sample page .

The anchor for the line above is:
<a href="wp01-basicpage.htm">"basic" sample page </a>

Note that if you don't specify the HREF as "http:" it assumes you mean a file and not a URL.

You don't have to click on text. You can have the viewer click on a picture.

Click on the image to go to the sample pages list:

The anchor for the line above is:
<a href="wp00.htm"> <img width=160 src="shapes.gif"> </a>