What is the purpose of nails?

The primary purpose of nails is to protect the tips of fingers and toes. Nails are composed of a tough protein called keratin, which provides a hard barrier against physical damage, potential infections, and injury to the sensitive tissues underneath. This protective function is crucial because the fingertips and toes are often exposed to various environmental hazards, making it essential for nails to act as a safeguard.

Nails also serve additional functions, such as enhancing the appearance of hands, providing a gripping surface for better manipulation of objects, and playing various roles in human interaction. However, the main role of nails is their protective capability, which is why the chosen answer is the most accurate in the context of their fundamental purpose.