The navel, commonly known as the belly button, is a small, central scar on the abdomen. It is the remnant of the umbilical cord, which connects a developing fetus to its mother during pregnancy. After birth, the umbilical cord is cut, leaving behind the navel as a permanent mark. The navel can vary in shape and size among individuals. It serves no significant biological function in adults, but it can be a point of interest in anatomy and culture. In some cultures, the navel is associated with beauty and body art, leading to practices like navel piercings.