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What is the Difference Between Ad Unit Impressions and Ad Impressions?

There are a few different variables that warrant explanation in the Sovrn Ad Management platform.

Ad impressions are the number of times that an actual creative is served.

An ad unit impression is the number of times that an ad slot served at least one impression (excluding ad refreshes/reloads).

(ad unit impressions รท unit impressions) = average number of refreshes

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