A nail is a hard part of the body at the tip of the fingers and toes, of which most people have ten. Toenails and fingernails are similar, except that toenails grow four times slower. Only mammals have nails. Like hair, nails never stop growing. They must be cut from time to time. It does not hurt when you cut your nails. The nails are made up of a protein called keratin. Hair and skin also have keratin. Some people paint their nails to make themselves look nicer. Some nails can grow into the skin. This is called an ingrowing nail. They can hurt, so are often treated through medicine.
The cutting and painting of the nails is called a manicure.