Personally identifiable information (PII) includes details that can identify an individual, such as names, addresses, phone numbers, credit card data, or loyalty account information. At your Ace Hardware store, PII is typically collected during transactions or customer account setup and is stored in systems like the point-of-sale (POS) or loyalty program databases. This information must be protected using secure systems, strong passwords, and PCI-compliant practices to prevent unauthorized access or data breaches.