Definition of 'Cost Per Thousand - CPM'
The price of 1,000 advertisement impressions on one webpage. If a website publisher charges $2 CPM, that means an advertiser must pay $2 for every 1,000 impressions of its ad. The "M" in CPM represents the roman numeral for 1,000. CPM is the most common method for pricing web ads. However, an advertisement's success cannot be measured by CTR alone, because an ad that is viewed but not clicked on may still have an impact.
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