It is also known as a UUID. A unique anonymous user identifier for a specific user profile, which may be stored in a cookie in the user's browser and/or in a server-side cookie store. Ad marketers are not allowed to associate these identifiers with personally identifiable information (PII) in any way, and user identifiers do not necessarily correspond to a unique identity. By deleting cookies or using multiple browsers and multiple devices, a person can also be associated with multiple user IDs. On mobile devices, a single user ID can also be mapped to multiple device IDs (e.g. Apple IDFA, OpenUDID, etc.).
Literal Meanings of Unique User Id
Meanings of Unique:
A thing that has no equal or incomparable.
To be unique, unsurpassed, unbeatable or unbeatable.
A board owned by one owner.
Rare, unusual quality.
Sentences of Unique
Each person has a unique life, so each person has a unique journey. -Gary Koch.
Synonyms of Unique
singular, one of a kind, sui generis
Meanings of User:
Exploitative, (one who uses people, that is, treats people and looks at them in an unfair, selfish and/or unethical way).
Meanings of Id:
The unconscious impulsive component of personality in Freud's psychoanalytic model.
A freshwater fish of the carp family found in Northern Europe and Asia, especially Leuciscus idus.
Used in citations to indicate that the citation refers to the work cited directly above.