An advertising message that appears on a User’s device in such a way that it creates an “opportunity to be seen” by the User. Whether an ad is view-able is determined by whether it meets certain pre-defined parameters; i.e., it appears on the view-able space of the mobile device screen, is not obstructed in a significant manner (for instance, is less than 50% obstructed), for a specified period of time (for example, at least one consecutive second).
Display filtering is based on view-able ads only.

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