Biometric data refers to unique physical or behavioral characteristics - such as fingerprints, facial features, iris patterns, or voice - that can be measured and used to identify individuals. In cybersecurity, biometric data is commonly used for authentication and access control, offering a secure alternative to traditional passwords. Because these traits are difficult to replicate or steal, biometric systems enhance security for devices, accounts, and sensitive information. However, the collection and storage of biometric data raise privacy concerns, making its protection a critical aspect of modern digital security.