An Ad Tag is an HTML tag that is placed in your source code in the location where you want ads to appear. Ad tags are used by the AdPlugg server to know the exact place in your source code to insert the ad. This placement affects where the ad will be displayed on your site.
An AdPlugg Ad Tag looks something like the following:
<div class="adplugg-tag" data-adplugg-zone="topbar"></div>
The above tag tells the AdPlugg ad server to render ads for the Topbar Zone in the location where the tag is placed on your site.
If you are using the WordPress Ad Plugin, Ad Tags are automatically created when you add the AdPlugg Widget into a WordPress Widget Area but you can also add Ad Tags directly into your WordPress template source code.
Note: you may not need to do this if you are using the WordPress Ad Plugin (see above).