When cookies are restricted, companies use your device's unique characteristics—screen resolution, fonts installed, browser plugins, timezone—combined with behavioral patterns to identify and track you across sites. This fingerprinting works precisely because these attributes are stable enough to be reliable but varied enough across users to create a usable identifier that survives anonymization attempts.
Browser fingerprinting is a technique that identifies and tracks you online by collecting unique attributes of your browser and device, such as screen resolution, installed fonts, and graphics rendering behavior, without using cookies. Because this fingerprint is remarkably stable and unique, it allows advertisers and data brokers to follow you across sessions even after you clear your browsing history.
AI systems can construct and match these fingerprints with high accuracy, making cookie-blocking alone insufficient for true privacy protection, and knowing how fingerprinting works empowers you to take targeted steps to reduce your trackable uniqueness online.
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