Click-Through Attribution

Click-through attribution is the rule that a conversion gets credited to an ad only if the user actually clicked that ad within a defined lookback window — clicked Tuesday, bought Friday, campaign credited. It is the stricter half of platform attribution's two-channel accounting, opposite VIEW-THROUGH ATTRIBUTION, which credits ads the user merely saw. The distinction sounds technical and decides budgets: the same campaign can look heroic or pointless depending on which kinds of credit the report admits.

Mechanically, the platform logs the click (a click ID, a matched identifier), and when a conversion arrives within the lookback window — commonly 7 or 30 days for clicks — the conversion joins the click and the campaign takes credit (with CONVERSION LAG meaning recent cohorts are always still filling in). The window is a real decision: too short and considered purchases fall off the books; too long and stale clicks harvest credit from demand they barely touched. Click-through's claim to rigor is the intent signal — a click is an action, so the connection between ad and buyer is at least behavioral, not merely optical. But rigor has degrees, not absolutes. A click does not prove causation (the branded-search click from someone already coming was still a click — the gap CONVERSION LIFT testing exists to expose), fat thumbs and accidental mobile taps count, and CLICK FRAUD manufactures the signal outright. The practical reading discipline: know each platform's default mix (many report click-through and view-through summed unless told otherwise), compare channels only on matched settings — judging a clickable search format against a glanceable display format requires separating the credit types — and treat click-through numbers as the floor of plausibility, view-through as the speculative layer, and lift tests as the truth serum.

Click-through attribution matters whenever channels are compared or budgets reallocated, because mixed credit types make every comparison apples-to-noise. It matters most for channels at the extremes — search lives almost entirely on clicks while display and video lean on views, so the credit rules ARE the channel comparison. The discipline is to fix the settings before reading the chart: separate click-through from view-through in every report, match windows across platforms as closely as their tools allow, and calibrate the whole click-based ledger against periodic incrementality tests — a click connects an ad to a buyer, but only an experiment connects it to a sale that needed the ad.

Click-through attribution descends from the click-tracking that made early digital advertising auditable — the click was the first countable proof an ad reached a human, and crediting conversions to clicked ads followed naturally. The click/view split hardened into standard platform accounting as display advertising needed a credit mechanism for ads nobody clicks.

Etymology: source.

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