Number of times a piece of content was delivered to a user's browser.
Impressions are most often used to count the number of times an advertisement was delivered to a user, but an impression can be used for other content such as a promotion, news story, or search result.
Note that when impressions are used to track 3rd-party advertisements, the methodology for tracking is defined by standards from the Interactive Advertising Bureau (IAB). When comparing impressions from an ad vendor with impressions measured in a web analytics tool, be aware that different methodologies may be used, leading to different counts.
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