CPM

Cost Per Mille (CPM), often referred to as "cost per thousand impressions," is a pivotal term in the digital marketing glossary. CPM represents the cost incurred by an advertiser for every thousand impressions of their online ad. Unlike Cost Per Click (CPC), where advertisers pay for actual clicks, CPM is a model focused on the cost per potential exposure, making it particularly relevant for brand awareness campaigns.

In CPM-based advertising, the advertiser pays a set rate for every one thousand times their ad is displayed, regardless of whether users engage with it. This pricing model is prevalent in display advertising, where the goal is to maximize visibility and create brand recall. Advertisers often use CPM to assess the efficiency of their ad spend in terms of reaching a broad audience.

Expert Tip:

"To master CPM in 2026, stop chasing the lowest price and start optimizing for Attention Metrics. A low CPM is a vanity metric if your ad is 'loaded' but never actually enters the user's viewport; focus on high-viewability environments to ensure your spend actually translates into brand lift."