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Personal data, also known as personal information or personally identifiable information (PII) is any information relating to an identifiable person.
The abbreviation PII is widely accepted in the United States, but the phrase it abbreviates has four common variants based on personal / personally, and identifiable/identifying. Not all are equivalent, and for legal purposes, the effective definitions vary depending on the jurisdiction and the purposes for which the term is being used. Under European and other data protection regimes, which center primarily around the General Data Protection Regulation, the term “personal data” is significantly broader, and determines the scope of the regulatory regime. National Institute of Standards and Technology Special Publication 800-122 defines personally identifiable information as “any information about an individual maintained by an agency, including (1) any information that can be used to distinguish or trace an individual’s identity, such as name, social security number, date and place of birth, mother’s maiden name, or biometric records; and (2) any other information that is linked or linkable to an individual, such as medical, educational, financial, and employment information.” So, for example, a user’s IP address is not classed as PII on its own but is classified as a linked PII. However, in the European Union, the IP address of an Internet subscriber may be classed as personal data. Personal data is defined under the GDPR as “any information which [is] related to an identified or identifiable natural person”.

The concept of PII has become prevalent as information technology and the Internet has made it easier to collect PII leading to a profitable market in collecting and reselling PII. PII can also be exploited by criminals to stalk or steal the identity of a person, or to aid in the planning of criminal acts. As a response to these threats, many website privacy policies specifically address the gathering of PII, and lawmakers such as the European Parliament have enacted a series of legislation such as the General Data Protection Regulation (GDPR) to limit the distribution and accessibility of PII. Important confusion arises around whether PII means information which is identifiable (that is, can be associated with a person) or identifying (that is, associated uniquely with a person, such that the PII identifies them). In prescriptive data privacy regimes such as HIPAA, PII items have been specifically defined. In broader data protection regimes such as the GDPR, personal data is defined in a non-prescriptive principles-based way. Information that might not count as PII under HIPAA can be personal data for the purposes of GDPR. For this reason, “PII” is typically deprecated internationally.