What's the main difference between reach and impressions in advertising?

The main difference between reach and impressions is crucial for understanding ad performance in digital marketing. Reach refers to the total number of unique individuals who have seen an ad at least once. This metric helps advertisers gauge how many different people are exposed to their advertisement, indicating the breadth of audience engagement.

Impressions, on the other hand, measure the total number of times an ad is displayed, regardless of whether it was clicked or even seen by a user. This means that if a single person sees an ad multiple times, each occurrence is counted as a separate impression, which can inflate the total metric.

Thus, the correct answer highlights that impressions represent the frequency of ad appearances, while reach focuses on the unique audience exposed to the ad. Understanding this distinction allows marketers to better analyze the effectiveness of their advertising campaigns and make informed decisions about targeting and reach strategies.