These frequently asked questions related to biometrics are followed by a mini-glossary .
Examples are fingerprint scanning, facial recognition, palm geometry, and voice recognition.
There are three levels of security. The lowest level is provided by something you have such as a badge, a pass, or a key. The second level is secured by something that you know may not be known by others, such as a PIN number or your mother's maiden name. More secure than a badge, but still insecure. One of the biggest advantages is convenience.