Quasi-identifier

A quasi-identifier is a piece of information that, on its own, doesn't directly reveal someone’s identity but can potentially be combined with other data to identify an individual. For example, details like age, ZIP code, or gender may not uniquely identify a person alone, but together they can often narrow down or pinpoint who someone is. Protecting against re-identification involves managing these quasi-identifiers to prevent unintended disclosures of personal information in datasets.