The document discusses palm vein technology, which uses the unique pattern of veins in a person's palm for biometric identification and authentication. It provides an overview of how palm vein technology works, including how palm vein patterns are registered and used to verify a person's identity. The technology is highly secure since vein patterns are internal and difficult to forge. The document also outlines some advantages and applications of palm vein technology, such as its use for ATM access and electronic payments.