Personal Health Information (PHI) refers to any data related to an individual's health status, medical history, treatment, or payment for healthcare that can be linked to a specific person. PHI includes details such as names, addresses, birth dates, Social Security numbers, medical records, lab results, and insurance information. In the context of cybersecurity, PHI is highly sensitive and protected under privacy regulations like HIPAA in the United States. Organizations handling PHI must implement strict security measures to prevent unauthorized access, disclosure, or misuse, as breaches can lead to identity theft, financial loss, and legal consequences. Protecting PHI is crucial for maintaining patient trust and complying with legal requirements.