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Cross‑Site Tracking

Tracking

Tracking Third‑Party Cookies Cookie Syncing Tracking Pixel

Cross-origin user linkage across web contexts.

Definition

Cross‑site tracking correlates identifiers and events across origins to maintain continuity of identity, using cookies, redirects, pixel beacons, and probabilistic techniques.

In plain English Cross-origin user linkage across web contexts.

Why this matters

Why it matters: It enables broad profiling and re-identification, and undermines contextual privacy.

Example

Example: Third-party scripts syncing identifiers between multiple domains.