App Tracking Transparency Codex: the ultimate guide to ATT, IDFA deprecation, and SKAdNetwork
Briefly

Apple threw the entire mobile ecosystem into a frenzy at WWDC in June 2020 when it announced a radical new change to the way the Identifier for Advertisers (IDFA) could be accessed and used for advertising tracking.This change takes the form of the new App Tracking Transparency (ATT) framework: developers will need to collect an explicit opt-in from users before accessing their IDFA.
Read at Mobile Dev Memo by Eric Seufert
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