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Fingerprinting, which involves gathering detailed information about your browser's or your phone's settings, falls into this category. The tracking method is largely hidden, there's not much you can do to stop it, and regulators have done little to limit how companies use it to follow you around the internet.

What Is Fingerprinting?

The exact configuration of lines and swirls that make up your fingerprints are thought to be unique to you. Similarly, your browser fingerprint is a set of information that's collected from your phone or laptop each time you use it that advertisers can eventually link back to you. ...