An “impression” is one chance of viewing an advertisement by a single member of its audience. In other words, when one person views/hears your ad one time this equals one impression. Target impressions are served to a specific audience segment. High value impressions target high purchase intent customers. Unique impressions are delivered to specific individuals.
CPM refers to cost per thousand, or cost to reach one thousand units (people, households, circulation, impressions, etc.) via a given advertising outlet or medium. PCI, or per column inch, is how print publications measure their display ads. CPC stands for cost per click: the amount of money an advertiser pays when a user clicks their ad once. These tools are used in marketing to create a benchmark to calculate relative cost of an advertising campaign or an ad message in a given medium.
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