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Tracking Pixel

Tracking

Third‑Party Cookies Cookie Syncing Third‑Party Tracking Email Tracking

Beacon mechanism that triggers a request to log an event and related metadata.

Definition

A tracking pixel (web beacon) causes the client to request a resource from a tracking domain, logging metadata (IP, user agent, referrer, identifiers) to measure opens, views, or conversions.

In plain English Beacon mechanism that triggers a request to log an event and related metadata.

Why this matters

Why it matters: It enables cross-site and email tracking even without obvious UI.

Example

Example: 1×1 pixel request includes identifiers and correlates activity across campaigns.