The Attribution Telemetry Glossary

Every debate about bidding, creative, or budget eventually hits the same wall: is the data even trustworthy? The people who can answer that are the ones who understand the plumbing — and the plumbing has its own vocabulary that quietly gatekeeps who gets to consult on strategy and who just runs the buttons. To understand the underlying data infrastructure, review our guide on server-side tagging.

Here’s the plain-English glossary. Learn these and the rest of the conversation opens up.

The core vocabulary

Nothing here is as complicated as the acronyms make it sound. For more on query control, see our approach to negative keywords.

• Click ID (GCLID / FBCLID / MSCLKID): a tag each platform adds to the landing URL so a later conversion can be matched back to the exact click.
• dataLayer: a standardized JavaScript object where the site publishes events (page view, add-to-cart, purchase) for tools to read consistently.
• Tag manager (GTM): the router that listens to the dataLayer and decides which tags fire, when, and with what data.
• Consent Mode: the gate that adjusts or withholds tag firing based on the visitor’s consent choices.
• Server-side container: infrastructure you control that receives events first-party and forwards them to platforms, surviving ad blockers.
• Offline conversion import: sending closed-won deals (with their click ID) from your CRM back to the ad platform.

How the pieces connect

A click arrives tagged with a click ID. The site writes events to the dataLayer. The tag manager reads them, checks Consent Mode, and sends approved events — ideally through a server-side container — to the platforms. Later, when the lead closes in your CRM, an offline import ships that outcome back, matched by the click ID. That loop is the whole game.

Why the vocabulary is leverage

This expertise is scarce and expensive precisely because most marketers skipped it. When you can say exactly where a conversion is lost — a dropped click ID, a tag firing before consent, a missing offline import — you stop guessing and start diagnosing. That’s the difference between advice a client trusts and advice they nod along to.

Can you trace one conversion end to end?

Pick one real conversion and narrate its journey through every term above. Wherever the story breaks is exactly where your account is losing data — and closing that gap is worth more than any bid tweak.