Did you know that CPM actually doesn’t refer to “cost per million” but cost per thousand? The “M” in CPM refers to the Latin for “thousand.” This is a different option than Cost Per Click (CPC). With CPM, an advertiser is paying for impressions, or times that an advertisement shows up on a page. CPM is also referred to as CPI or Cost Per Impression. Why would someone choose this over the Pay Per Click model? The click-through rate may not be as relevant to every ad campaign’s success, especially if the goal is to generate brand recognition.