Step 2: Identifying your users – Amplitude
https://help.amplitude.com/hc/en-us/articles/206404628-Step-2-Identifying-your-users
Jan 07, 2022 . In Amplitude, a user ID is a unique identifier applied to individual users. Using them is optional, but recommended: your product should set a user ID once a user has created an account, logged in, or is otherwise identified in your product. Amplitude can use a user ID to reconcile events across multiple devices under the same user ID.
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