Biometric systems identify individuals by analyzing unique physical or behavioral traits. Common biometric modalities include fingerprints, facial recognition, iris scans, and voice recognition. These systems capture data through various sensors and convert it into a digital format for comparison against stored templates in a secure database. By employing algorithms, biometric systems evaluate the characteristics of the captured data to ascertain if there is a match. The accuracy and security of biometric identification make it a popular choice in areas like security, access control, and authentication.