Let say that you are putting together content in HTML for a webpage.  At the end of a sentence you want to put a supscript with a number as shown ...

The number 1 in brackets is the footnote. When the user clicks on this footnote, it will jump the user to the bottom of the page where all the footnotes are listed.

To do this in HTML, we wrap the supscript text with the ^and tag as shown...

We also wrap the subscript text with an link to the named anchor called "footnote1".

This named anchor is defined at the bottom of the page as highlighted here...