Definition[]
An impression (also called ad impression and page impression) is a single advertisement downloaded and seen by a single visitor to the website a single time.
Overview[]
Each time an advertisement loads onto a user's screen, the ad server may count that loading as one impression. However, the ad server may be programmed to exclude from the count certain nonqualifying activity, such as a reload, internal user actions, and other events that the advertiser and ad serving company agree not to count.
For online advertising, the numbers of views can be a lot more precise. When a user requests a web page, the originating server creates a log entry. Also, a third party tracker can be placed in the web page to verify how many accesses that page had.
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