PII
Also known as: personally identifiable information · PII data
PII (Personally Identifiable Information) is any data that can identify a specific person.
- Names, emails, phone numbers.
- Government IDs, addresses.
- Sometimes combinations (city + job + date of birth).
For LLMs the concern is feeding PII into prompts or storing it in logs.
The habit: strip or mask PII before it hits a model or a log. It's the single highest-value hygiene step for privacy.