DEFINITION: CPM or Cost per Thousand
It is “Cost per Thousand”, as in Roman numeral M represents 1,000. An advertiser pays CPM for getting 1,000 impressions on their ad.
Stands for “Cost Per Thousand” (M is the roman numeral for 1,000). This is the amount an advertiser pays for 1,000 impressions of their ad. For example, if a publisher charges $10 CPM, and your ad shows 2000 times, you will pay $20 for the campaign ($10 x 1000 impressions) x 2. Measuring ad success with CPM is most common in awareness campaigns, where impressions are more important than conversions or clicks.
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