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Human nails are hard, protective structures found at the tips of fingers and toes. They are composed of a tough protein called keratin. Nails serve several functions, including protecting the sensitive tips of fingers and toes, enhancing fine motor movements, and aiding in picking up small objects. The visible part of the nail is called the nail plate, which sits on the nail bed. Nails grow from the nail matrix, which is located under the cuticle. Healthy nails are generally smooth and free of spots or discoloration.