Reach
In digital marketing, reach is the number of unique users who see a particular ad or piece of content over a set time period. Reach differs from impressions. Impressions count how many times an ad or piece of content appears, while reach counts how many separate people see it. So if one person sees the same ad three times, that’s three impressions but a reach of one.
Reach helps you gauge brand awareness and how well a campaign is performing. It also shows whether your targeting is set at the right level, rather than too narrow or too wide.
See also: Engagement rate, Impressions