What is CPM???

Whether it is helpful for seo task

CPM
"cost per thousand (CPM): An ad model that charges advertisers every time an ad is displayed to a user, whether the user clicks on the ad or not. The fee is based on every 1,000 ad impressions (M is the Roman numeral for 1,000). Most display ads, such as banner ads, are sold by CPM."

This is used in SEM not in SEO.
You can also find other defination in the below url.
http://searchenginewatch.com/page/glossary

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