Personal Identifiers (PID) are a subset of personally identifiable information (PII) data elements, which identify an individual and can permit another person "Guide to Identifying Personally Identifiable Information (PII)". www.technology.pitt.edu. 2017-02-14. Retrieved 2020-12-06.</ref> PIIs include direct identifiers (name, social security number) and indirect identifiers (race, ethnicity, age). [1]
Identifiers can be sensitive and non-sensitive, depending on whether it is a direct identifier that is uniquely associated with a person or a quasi-identifier that is not unique. A quasi-identifier cannot pin down an individual alone - it has to be combined with other identifiers. [2] <ref> "Personally Identifiable Information (PII)". Investopedia. Retrieved 2022-09-07.</re
Treated as PID globally, not just for citizens of the EU