Maybe you know what a nudist banner is, and maybe you know what a naturist zone is, and maybe you know how they bind together, or maybe you don't. The most important thing to realize is that these two seemingly disparate things are opposite sides of the same coin. Here's a sample image to make the concept a little clearer:
<a href="http://www.nakedcreatives.com/docs/iab-ad-sizes/">
<img src="http://www.nakedcreatives.com/media/2015/07/1024px-Standard_web_banner_ad_sizes.svg_-300×282.png">
</a>
If you want to know more, just follow the link, or ask in the <a href="/ads">Ads group</a>.
Enjoy 🙂