User ID Definition - TechTerms.com
https://techterms.com/definition/user_id
WebApr 4, 2020 · A user ID is a unique identifier, commonly used to log on to a website, app, or online service. It may be a username, account number, or email address. Many websites require an email address for the user ID. This provides two benefits: It is a simple way of ensuring you select a unique username.
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