How does Facebook define an impression in the context of advertising?

In the context of advertising, Facebook defines an impression as counted each time an ad is displayed to a user. This definition highlights the fundamental aspect of how advertising visibility is measured on the platform. Each impression indicates an opportunity for the ad to be seen, regardless of whether the user interacts with it or not.

This measurement is crucial for advertisers as it provides insights into the reach and visibility of their campaigns. By tracking impressions, advertisers can gauge how often their ads appear in users' feeds, which impacts overall campaign effectiveness, brand awareness, and potential customer engagement.

Other options present specific actions, like clicking on an ad, which count as a different metric called "clicks," and saving an ad, which measures user interest but does not reflect visibility. Additionally, the restriction to only video ads is incorrect because impressions apply to all ad formats on Facebook, not just video content. Thus, recognizing an impression as every display of an ad emphasizes the broad scope of ad visibility on the platform.