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{{Use dmy dates|date=April 2023}}
'''Cross-device tracking''' is technology that enables the tracking of users across multiple devices such as smartphones, television sets, smart TVs, and personal computers.
More specifically, cross-device tracking is a technique in which technology companies and advertisers deploy trackers, often in the form of unique identifiers, cookies, or even ultrasonic signals, to generate a
This form of tracking is used primarily by technology companies and advertisers who use this information to piece together a cohesive profile of the user.
==Background==
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Another tactic used by Google is called [[Ad-ID|AdID]] and works on smartphones in tandem with cookies on a user's computer to track behavior across devices.<ref name=":23" />
Now, cross-device tracking has evolved into a new, radical form of surveillance technology which enables users to be tracked across multiple devices, including [[smartphone]]s, [[Television|TVs]], and personal computers through the use of audio beacons, or inaudible sound, emitted by one device and recognized through the microphone of the other device, usually a smartphone.<ref name=":15">{{Cite book |last=Arp |first=Daniel |title=2017 IEEE European Symposium on Security and Privacy (EuroS&P) |year=2017 |isbn=978-1-5090-5762-7 |pages=1–13 |chapter=Privacy Threats through Ultrasonic Side Channels on Mobile Devices |doi=10.1109/EuroSP.2017.33 |chapter-url=https://ieeexplore.ieee.org/document/7961950 |via=IEEE Xplore |s2cid=698921}}</ref> In addition, cross-device tracking may presage the future of the [[Internet of things]] (IoT), in which all types of devices––such as offices, cars, and homes––are seamlessly interconnected via the internet.<ref name=":23" />
=== Ultrasonic tracking ===
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