Fixed zones vs. dynamic zones
When you create a zone in AdButler, you must choose whether it will be fixed or dynamic in terms of the ad size that it will accept. A fixed zone accepts only ad items and campaigns with ad items that match its size. For example, a 300 x 250 pixel fixed zone will accept only ad items that are also 300 x 250 pixels. This restriction ensures that all ads assigned to the zone will fit and look great on the page or app.
A dynamic zone on the other hand can accept and will show ads of any size. This is great when you want to run different sized ads in that zone, say a 300 x 250 ad for the desktop version of a page, and a 320 x 50 ad for the mobile version. Dynamic zones also allow for interstitial popup ads.
However, the lack of ad size restrictions in dynamic zones also means that you could end up with awkward looking ads. For example, a 300 x 600 ad will be resized to fit in a dynamic zone where the actual space on the page is meant for a 728 x 90 leaderboard ad. This means you still need to consider the actual available space on the publisher's website or app when assigning ads to a dynamic zone.
Normally, the delay in syncing the ad with the rest of the page's contents is imperceptible to the website visitor or app user, as it's usually only between 50 to 80 milliseconds. However, that period is compounded when a zone is auctioned off using programmatic or automated bidding.