Neoteny is a biological phenomenon where an organism retains juvenile traits into adulthood. This can include physical characteristics, behaviors, or reproductive features that are typically associated with younger stages of development. Neoteny is observed in various species, including some amphibians and mammals, and can influence evolutionary processes by allowing adults to adapt to their environments while maintaining youthful traits. In humans, neoteny is evident in features such as a flat face and large eyes, which resemble those of infants. This retention of juvenile characteristics may have social and evolutionary advantages, as it can promote nurturing behaviors and social bonding. Neoteny plays a significant role in the study of evolutionary biology and developmental psychology.