CPM is an advertising pricing model where the advertiser pays per 1,000 impressions (views), regardless of clicks or conversions. "Mille" is Latin for thousand. CPM is the standard model for brand awareness campaigns, display advertising, and newsletter sponsorships.
For affiliate marketers running display placements, CPM is a useful metric to benchmark media efficiency — but conversion tracking downstream is essential because a high CPM can be justified by strong conversion rates. Newsletter CPMs in B2B SaaS niches typically run $40–$150 per thousand, significantly above broad consumer audiences.