Definition
Biometrics refers to the measurement and statistical analysis of unique physical or behavioral characteristics used for identification and authentication. These characteristics, such as fingerprints, facial features, iris patterns, or voiceprints, are captured and converted into digital templates. In practice, biometric systems compare a live sample against a stored template to verify identity. This technology is crucial for enhancing security by providing a more reliable and convenient way to control access to sensitive systems and data than traditional passwords or tokens. For instance, unlocking a smartphone with a fingerprint scan is a common daily application of biometrics. While often confused with multi-factor authentication, biometrics typically serves as one factor, often replacing or supplementing something you know (like a password) or something you have (like a key card). Understanding biometrics is essential for IT professionals and appears on certifications like CompTIA Security+ and CySA+.