Smartphones utilize biometric authentication to enhance security through unique physical characteristics, such as fingerprints, facial recognition, or iris scans. This technology captures and analyzes biometric data for user verification. For instance, a smartphone with a fingerprint scanner records the user's fingerprint data and compares it during each access attempt. If the data matches, the device unlocks. Biometric authentication provides a more secure alternative to traditional passwords, reducing the risk of unauthorized access due to easier-to-forget or steal credentials.