What is the difference between display ad reach and display ad impression in terms of affiliate marketing?

[Brajet]

In affiliate marketing, display ad reach and display ad impressions are key metrics that reflect different aspects of an ad campaign's performance. Reachrefers to the total number of unique users who see the ad at least once. It measures how widely the ad is distributed across an audience. In contrast, impressions count the total number of times the ad is shown, regardless of how many times a single user sees it. One user may generate multiple impressions. For affiliates, understanding this difference is crucial—reach shows audience breadth, while impressions indicate exposure frequency. High impressions with low reach may signal ad fatigue, while high reach with low impressions might suggest limited user engagement or budget constraints. Both metrics guide effective ad optimization.