Post View Attribution is an attribution model that is based on the idea, that the last channel or platform to show a person an ad receives credit for it.
However, this attribution model is even less accurate than the post-click model, as it encourages advertisers to place their ads as widespread as possible in order to take credit for the conversion, even if the customer does not actually see the ad.
The benefit to post-view is that it enables marketers to measure if the viewing of the ad actually resulted in an outcome.
However, the risk associated with this model is that not every ad that is shown to a potential customer is actually seen. For example, a banner ad that is placed in a mobile app or on a website might be present on the screen of the device, but is not necessarily noticed by the user.