Cybersecurity

What is Personally Identifiable Information?

Quick answer

Any information that can identify a specific person, alone or combined with other data, such as a name, email, or ID number.

Personally Identifiable Information, explained

Personally identifiable information, or PII, includes direct identifiers such as full names, phone numbers, email addresses, government ID numbers, and photos, as well as indirect details like birth dates or postcodes that can identify someone when combined. Laws use different terms; the GDPR, for example, uses the broader concept of personal data.

Businesses handle PII constantly, in customer records, employee files, and booking systems. A travel agency, for instance, may store passport numbers and dates of birth for clients. Protecting PII involves collecting only what is needed, restricting access, encrypting sensitive fields, keeping data only as long as necessary, and avoiding pasting it into tools that are not approved for it, including public AI chatbots. A breach of PII can bring legal penalties and lasting reputational harm.

Related terms

Guides that mention Personally Identifiable Information