An ad unit is specific area that you'd like to show an ad in. You'll want to use one ad unit per ad on a page.
Create an ad unit
Navigate to the site in the ContextCue Publisher application that you want to put an ad on
Click "ad units"
Click "+ ad unit" near the top left
Add the name. This is just an easy to remember name. Ex. "header ad unit"
Select the categories of ads that are relevant to your site
Click "Create ad unit"
What is the "ad unit ID"?
The ad unit ID is a unique identifier for this ad slot, which enables us to provide better analytics as to which ad slots are performing the best. This ID is a part of the code used to integrate ads into your site.