Individual users, as represented by a unique user ID. A unique user ID is not associated in any way with personally identifiable information (PII), so it cannot identify a specific unique individual. Also, an individual may be associated with multiple user IDs due to clearing browser cookies or using multiple browsers and multiple devices. Additionally, for mobile devices, a unique user ID may be associated with multiple device IDs (for example, Apple IDFA, OpenUDID, and others). See reach to learn more about individual users/user IDs.
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