Banner
This object represents the most general type of impression.
Although the term "banner" may have very specific meaning in other contexts, here it can be many things including a simple static image, an expandable ad unit, or even in-banner video (refer to Video for generalized and full featured video ad units). An array of Banner objects can also appear within the Video to describe optional companion ads defined in the VAST specification. The presence of a Banner as a subordinate of the Impression object indicates that this impression is offered as a banner type impression. At the publisher’s discretion, that same impression may also be offered as video, audio, and/or native by also including as Impression subordinates objects of those types. However, any given bid for the impression must conform to one of the offered types.