This document discusses biometrics and biometrics research at Clemson University. It defines biometrics as automated methods of recognizing individuals using biological and behavioral characteristics. It describes several types of biometric recognition including fingerprint, iris, facial, voice, hand geometry, signature, and retina recognition. It also discusses commercial, government, and forensic applications of biometrics and constraints on biometric systems like lighting and pose. Finally, it outlines biometrics research at Clemson University focused on usable and unconstrained biometrics including aging effects, demographics, periocular recognition, and ear recognition.