<http://schema.org/description>
"Google AdSense has an ad unit named \"link units.\"  The link unit ads look like links and if you click on them, they take you a landing page of Google ads.  In the past, those ads were only text ads.  "^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/020097.html>