Display ads
Display ads (display banner) is a banner ad aimed at creating a specific brand image for consumers. Display banners are usually static or dynamic images that attract the user's attention.
Example of a display banner

Fixed formats
Fixed display banners are created by advertisers and have strictly set sizes:
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Horizontal |
Vertical |
With adaptive width |
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Unlike Combinatorial ads and adaptive display ads, the design of these banners isn't flexible: the ad is displayed only how it was created and configured by the advertiser.
When displayed, a fixed display ads is selected based on the unit size: the banner must completely fit inside the unit and fill it as much as possible. Display banners that are too small won't be displayed in the unit.
Adaptive display ads
Adaptive display ads (smart banners and media creatives) adapt to the size of the ad unit. The design of these ads is generated automatically for each individual impression.
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When you're configuring the Fixed size, dimensions with adaptive width will be available if you only enter the height.