Described layman's interpretation of what is a CPM is in internet online advertising?

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CPM (Cost Per Impressions) is the cost per thousand a web site charges for an advertisement on a web site page. Internet advertising is typically sold on a CPM basis. An impression occurs when a visitor to a web site views a page where an ad is displayed. A $25 cpm rate represents $25 per 1,000 displays of a web site page where an ad is displayed.
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