Published: 2026-02-13 · Paid Media · Ricky Bandelin
Understanding bidding strategies is one of the most important skills in paid advertising. Choose the wrong model and you overpay for traffic that never converts. Choose the right one and your campaigns generate efficient, scalable returns.
This article breaks down the three primary bidding models — CPM (Cost Per Mille), CPC (Cost Per Click), and CPA (Cost Per Acquisition) — and explains when to use each based on your campaign objectives.
Cost Per Mille (CPM)
CPM is a bidding model where advertisers pay for every thousand impressions their ads receive. An impression is counted each time an ad is displayed, regardless of whether anyone clicks or takes action.
CPM is typically the most efficient model for brand awareness campaigns where reach and visibility are the primary objective. Because you are paying for exposure rather than action, CPM works best when your creative is strong enough to generate awareness without requiring a click to be effective.
The risk with CPM is that you can accumulate significant spend with no measurable downstream impact if your creative, targeting, or landing page is not optimized.