Can anyone explain me what is href and ref in <link>

Question

Like in this tag:
<link rel="stylesheet" href="example.css">

I can understand that in href section it contain the .css file name in the same directory
Can I use any other name in rel section???
Please explain.

Answer 1

https://www.sitepoint.com/rel-html-attribute/

Answer 2

Tnx for your response. But can we use any name in rel section??

Answer 3

For link to a file css can't