In cybersecurity, a biomarker refers to a measurable biological characteristic used to verify or identify individuals. Biomarkers can include fingerprints, facial features, iris patterns, or even behavioral traits like typing rhythm. These unique biological indicators are often used in biometric authentication systems to enhance security by ensuring that access is granted only to authorized users. Biomarkers are considered more difficult to forge than traditional passwords, making them a valuable tool in protecting sensitive information and systems from unauthorized access. However, the use of biomarkers also raises privacy concerns and requires careful handling to prevent misuse or data breaches.