Creative wrapping works by creating a container around each ad unit on the webpage. So for each webpage, everywhere there is a space for an ad, a wrapper needs to be created. Within this wrapper is where the code for integrating your chosen anti-malvertising solution would go.
This works in a similar way to putting a fence around each ad unit to provide protection for just that particular portion of the page.
This approach is the industry standard, and allows the script to monitor activity within each ad unit, detecting and blocking any known malvertisers from running ads on your page. But creative wrapping can quickly become a tedious maintenance lift once new threats begin targeting your site.
On a particular page, your team will have to work to maintain an integration for each individual ad unit, across your entire site, for each different page type you have, in order to make sure protection is up to date. That can quickly multiply into hundreds of ad unit containers to keep track of and manage.