Reach
Reach is the number of different people or accounts exposed to a piece of content or a campaign over a period
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
It differs from impressions, which count exposures and may include repeats. How it is calculated depends on the platform and the identification method. When combining channels, duplication should be taken into account to avoid counting the same audience several times.
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