Define the term "impression" in digital advertising.

In digital advertising, "impression" refers specifically to every instance an ad is displayed in an ad space. This means that each time an advertisement appears on a user's screen, it counts as one impression, regardless of whether the user interacts with it or not. The concept is crucial as it helps advertisers measure the visibility and reach of their ads.

The focus on impressions allows marketers to understand how often their ads are being shown, which is an essential metric for evaluating the effectiveness of a campaign. Tracking impressions provides insights into audience exposure, enabling advertisers to make data-driven decisions regarding campaign strategies based on how many times their ads are viewed.

Understanding the distinction between impressions and other metrics like clicks or actions taken by users is important. While clicks measure direct interactions with an ad, impressions track the total exposure potential, forming a foundational aspect of digital advertising metrics.