PII

Also known as: PII, personally identifiable information

Personally identifiable information refers to any data that can be used to identify, locate, or contact a specific individual — including names, addresses, phone numbers, email addresses, government IDs, and biometric data. In AI systems, PII can appear in training data, user queries, and model outputs. Handling PII responsibly requires detecting and redacting it in datasets before training, preventing models from reproducing memorized PII during inference, and complying with privacy regulations such as GDPR and HIPAA.