thumb print matching scan.A fingerprint in its narrow sense is an impression left by the friction ridges of a human finger.Fingerprint identification, known as dactyloscopy or hand print identification, is the process of comparing two instances of impressions from human fingers,thumbs or toes, or even the palm of the hand or sole of the foot, to determine whether these impressions could have come from the same individual. The flexibility of friction ridge skin means that no two finger or palm prints are ever exactly alike in every detail; even two impressions recorded immediately after each other from the same hand may be slightly different. Fingerprint identification, also referred to as individualization.