What is Impression?
A single instance of an ad being displayed to a user.
Definition
An impression is counted each time your ad is rendered on a user's screen. Impressions differ from reach: reach counts unique users, while impressions count total views (including repeat views by the same user). If 100 people each see your ad 3 times, that's 100 reach and 300 impressions. Impressions are the basis for CPM pricing and frequency calculations. View-through metrics like viewable impressions (the ad was actually visible on screen) provide more meaningful measurement.
Example
A campaign generates 100,000 impressions across 25,000 unique users, resulting in a frequency of 4.0. The brand monitors this ratio to avoid ad fatigue.
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