About this interactive
The PII lesson shows that NIST defines personally identifiable information several ways, and works through three of them.
The first is the narrowest: information that identifies one specific person. Under it a rare name is PII but a common name such as Andrew is not, and a home address is PII only when one person lives there.
The second is the one the lesson says to use: information that can distinguish or trace a person's identity, such as a name, a Social Security number or biometric records. A name is always PII under it, common or not, and so is a home address, however many people live there. It is the practical choice because data sets get combined, and any name might turn out to be unique.
The third adds anything linked or linkable to a person, such as medical, educational, financial and employment information. The lesson finds it too broad to guide how different data is handled.
So the lesson splits two kinds of data. PII identifies who you are. Personal information, PI, is about you without identifying you: a grade on a paper, a deposit, a test result. Once PI sits in a record next to a name, that record identifies you and has to be protected as PII. Laws use their own terms; GDPR's personal data covers both.
A quick test for each card, taken on its own: could this lead someone to who the person is?
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