A fingernail is a hard part of the body at the tip of the fingers, of which most people have ten. Toenails are similar, except that they grow four times slower and are on the toes. Only mammals have fingernails. Like hair, fingernails 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 fingernails can grow into the skin. This is called an ingrowing fingernail. They can hurt, so are often treated through medicine.
The cutting and painting of the nails is called a manicure.