CPA Meaning in Plain English
The “A” must be defined. A purchase, qualified lead, form submission, and button click have very different business value even if a platform labels each one a conversion.
CPA based only on media spend differs from a full customer acquisition cost that includes sales, tools, labor, and other marketing expenses.
Example
If a campaign spends $600 and records 12 qualified form submissions, its media CPA for that action is $50.
Why It Matters
CPA helps compare efficiency when tracking is accurate and the action reflects a meaningful step.