Humans have fingerprints primarily because they evolved to improve our ability to grip objects and enhance tactile sensitivity. Fingerprint ridges increase friction, allowing for better gripping and manipulation of objects, and they also amplify sensory vibrations that increase our touch perception. This helps in tasks like detecting textures, avoiding harmful substances, and fine motor skills essential for daily activities. Additionally, fingerprints may provide some resistance to skin blistering. Fingerprints are formed during fetal development due to genetic factors and the environment inside the womb, making each person's fingerprints unique even among identical twins. They remain unchanged throughout life and serve important roles in touch, grip, and identification.