Native object
A Native object offers an impression as native: an ad assembled from parts such as a title, image, and description so it matches the surrounding content. It wraps a request defined by the separate IAB Native Ads specification, carried as a string. Added in OpenRTB 2.3.
How it is used
OpenRTB carries the native request opaquely so the Native Ads specification can change on its own schedule. The response mirrors that design: the native markup comes back as a JSON-encoded string in Bid.adm. OpenRTB 3.0 dropped the string wrapper and models native assets directly in AdCOM.
The Native ads page covers it in more depth.
Fields
Where it sits
Contained in: Imp.
All objects
The field reference index lists every OpenRTB 2.x object.