Definition
Impressions = total times seen (if same person sees ad 5 times, that's 5 impressions); Reach = unique people (that same person counts as 1).
Example Usage
Our campaign had 10 million impressions but only 2 million reach, meaning we were traumatizing a small group repeatedly.
Origin
Media and advertising measurement terminology
Fun Fact
High impressions with low reach means you're showing the same people your ad repeatedly, which is either brilliant targeting or depressing failure depending on your perspective.
Source: Media Measurement Standards (MRC)
Related Terms
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See “Impressions vs. Reach” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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