What is IDFA and why is this iOS update important? - Mozilla
https://blog.mozilla.org/en/internet-culture/turn-off-idfa-for-apps-apple-ios-14-5/
WEBApr 26, 2021 · IDFA, or identifier for advertisers, is a random identification number, similar to a cookie, that tracks what you do in apps on your device. Each iPhone comes equipped with its own unique ID attached, which allows advertisers to track your interactions from what you click on, to what apps you install, to what videos you watch.
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