AI-generated Key Takeaways
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          CreativeSizeType describes the different ways a creative's size can be defined, beyond just height and width. 
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          Creative sizes can be based on specific pixel dimensions, aspect ratios for mobile, or be out-of-page (interstitial). 
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          Some creative sizes, like IGNORED, NATIVE, and AUDIO, are used in specific contexts and require a 1x1 size. 
Descriptions of the types of sizes a creative can be. Not all creatives can be described by a height-width pair, this provides additional context.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202505
| Enumeration | Description | 
|---|---|
| PIXEL | Dimension based size, an actual height and width. | 
| ASPECT_RATIO | Mobile size, that is expressed as a ratio of say 4 by 1, that could be met by a 100 x 25 sized image. | 
| INTERSTITIAL | Out-of-page size, that is not related to the slot it is served. But rather is a function of the snippet, and the values set. This must be used with 1x1 size. | 
| IGNORED | Size has no meaning 1. For Click Tracking entities, where size doesn't matter 2. For entities that allow all requested sizes, where the size represents all sizes. | 
| NATIVE | Native size, which is a function of the how the client renders the creative. This must be used with 1x1 size. | 
| AUDIO | Audio size. Used with audio ads. This must be used with 1x1 size. |