These are common acronyms used in the digital advertising sphere. Let's break them down so you can sell digital ads more effectively!
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​CPM (cost per thousand): the advertiser pays whenever the ad is displayed 1,000 times. In other words, with each thousand impressions, the buyer pays the agreed price. 

CPD (cost per day): a flat rate the buyer pays per day that the advertisement is displayed. Regardless of the number of impressions, the advertiser pays the same rate per day.