What is UTM Parameters (Urchin Tracking Module parameters)? — Meta Ads Glossary — details
UTM parameters are short tags added to the end of a landing page URL (utm_source, utm_medium, utm_campaign, and similar) that get picked up by analytics platforms like Google Analytics to attribute a visit back to the specific ad, ad set, or campaign that sent it. They're independent of Meta's own attribution and pixel system, giving a second, cross-checkable view of traffic source.
Agencies use dynamic UTM parameters that auto-populate with campaign, ad set, and ad names so that a client's analytics platform can be sliced by the exact same structure as Ads Manager, making it possible to reconcile Meta's reported numbers against an independent, platform-agnostic source of truth.

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