What does <link> tag do besides including stylesheets?

Question

I know that the HTML tag is used for attatching stylesheets, but looking at the W3CSchools tag reference, it has many other values for the rel attribute. I\'ve looked

Answer 1

Uh....

http://www.w3schools.com/TAGS/att_link_rel.asp

Basically, it's just a tag that says "other stuff needed for document is here", and the rel tag specifies exactly what that might be.