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A UTM (Urchin Tracking Module) parameter is a short tag added to the end of a URL that tells your analytics platform exactly where a visitor came from. Instead of seeing generic "referral" traffic, you see precisely which newsletter, ad, or social post drove the click.
Every tagged link carries up to five parameters — source, medium, campaign, term, and content — and every major analytics tool (GA4, HubSpot, Mixpanel) reads them automatically once they're in your link.