An access device is any tool, account, card, or credential - such as a credit card, debit card, bank account number, password, or electronic key - that allows a person to gain entry to financial or personal information systems. In cybersecurity and legal contexts, the term often refers to items used to access protected resources or conduct transactions, making them valuable targets for cybercriminals. Unauthorized use or possession of access devices is illegal in many jurisdictions, as they can enable identity theft, financial fraud, or unauthorized data access.