The way we all receive nutrition and what it takes to survive while in our mother's in the belly button. It is also known as the navel or medically, the umbilicus. This is a part of our anatomy and is the one feature that most humans share. They may be all different shapes and sizes. Some are "Innies" and others are "Outies". Many believe that you have one or the other depending on how the doctor cut it at birth, when this actually has nothing to do with it's shape.