How cross-site tracking actually works (and how to protect yourself)

Cross-site tracking involves recognizing the same device across multiple unrelated websites by using a shared identifier, creating a continuous trail of user behavior. This practice enables companies to compile detailed user profiles, often without the user's knowledge, by using techniques like cookies, IP tracking, and browser fingerprinting. While these identifiers start as simple recognition tools, they can lead to privacy concerns when combined into profiles that include personal information. The infrastructure supporting cross-site tracking has applications beyond advertising, such as government surveillance and differential pricing. Users can protect themselves by employing privacy-focused browsers like Safari with iCloud Private Relay or Firefox, using content blockers, and maintaining separate browser profiles for logged-in activities. Although complete invisibility online is challenging, adopting these measures can significantly reduce the ability of trackers to compile a stable and identifiable profile.

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