What is the different of between 'VIDEO_AD' and other AD VIDEO Types?

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Hi

Ad groups(ad_group_ad.ad.type) want to know the difference between 'VIDEO_AD' and other ad video types. (ex,VIDEO_BUMPER_AD)

I wonder if VIDEO_AD includes all type of AD VIDEOS.

I am asking after looking at the URL below.

  - URL : https://developers.google.com/google-ads/api/reference/rpc/v4/AdTypeEnum.AdType

Thanks