CPM stands for cost per thousand impressions and measures how much an advertiser pays to deliver a thousand ad views. It is commonly used in brand awareness and reach-focused campaigns, where visibility matters more than immediate clicks or actions.

A high CPM may reflect premium placement, a highly targeted audience, or seasonal competition, such as holiday-season retail campaigns. Conversely, low CPMs often occur on broad-reach platforms or content placements where competition is lighter.

For example, a global apparel brand may run campaigns at a $5–$20 CPM to build top-of-funnel awareness, while niche B2B campaigns might see higher CPMs due to specialized targeting. CPM helps advertisers gauge cost efficiency for exposure-focused campaigns.