Fingerprints form during fetal development in the womb, creating unique patterns that remain unchanged throughout a person’s life. By the 10th week of pregnancy, the skin on the tips of the fingers begins to form ridges due to the interaction between the growing layers of the epidermis (outer skin) and dermis (inner skin). These ridges develop as the fetus moves in the amniotic fluid, with factors like pressure, growth rate, and genetic influences shaping the patterns. The result is one of three primary fingerprint types: loops, whorls, or arches, each unique to the individual—even identical twins, who share the same DNA, have distinct fingerprints. Fingerprints serve an evolutionary purpose, improving grip and sensitivity to touch. Their intricate, unrepeatable designs have also made them a cornerstone of identification in forensic science and personal security systems.