The primary use of biometric authentication is to verify an individual's identity based on unique biological characteristics, such as fingerprints, facial recognition, or iris patterns. This form of authentication enhances security by providing a more robust method of access control than traditional passwords. Biometric systems are often used in various applications, including mobile devices, secure facilities, and financial services. The inherent uniqueness of biometric traits makes it difficult for unauthorized individuals to gain access, thereby improving overall security measures.