This document discusses palm vein biometric technology. It begins with an introduction explaining that palm vein recognition uses vein patterns in the palm to identify individuals contactlessly. It then explains that palm veins are protected inside the body, unique, and remain unchanged over a person's lifetime. The document proceeds to describe how palm vein systems work using infrared light to image palm vein patterns. It compares palm vein technology to other biometrics like fingerprints and iris scanning, noting palm vein's relative accuracy and cost. Applications discussed include use in hospitals, computers, ATMs, and door security. The document concludes that palm vein authentication could help solve identification problems.