| Definition: | a measurement of the user-initiated action of responding to (such as clicking on) an ad element causing a re-direct to another Web location or another frame or page within the advertisement. There are three types of ad clicks: 1) click-throughs; 2) in-unit clicks; and 3) mouseovers. Ad click-throughs should be tracked and reported as a 302 redirect at the ad server and should filter out robotic activity.
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