Biometric security is an advanced method of authentication that identifies and verifies an individual based on unique physiological or behavioral characteristics rather than relying on passwords or PINs. It is considered more secure because biometric traits are difficult to duplicate, share, or forget. Passwords can be guessed, stolen, or cracked using brute-force attacks, whereas biometric features such as fingerprints, iris patterns, facial characteristics, voice, and hand geometry are unique to each individual. Therefore, biometric authentication provides a higher level of security and convenience in network security environments. Biometric authentication is based on the principle that every person possesses distinct biological or behavioral traits. Physiological biometrics include fingerprints, face recognition, iris recognition, retina scanning, palm prints, hand geometry, and DNA analysis. Behavioral biometrics include voice recognition, signature dynamics, typing rhythm, gait analysis, and mouse movement patterns. These characteristics are measured, analyzed, and compared to verify a user's identity. The biometric process begins with the enrollment phase. During enrollment, the user first registers with the biometric system by presenting a