The labia are the external folds of skin that surround the vagina in female anatomy. They are part of the vulva, which includes other structures such as the clitoris and the urethra. The labia are typically divided into two parts: the labia majora, which are the larger outer folds, and the labia minora, the smaller inner folds. The primary functions of the labia include protecting the internal reproductive organs and providing sensitivity during sexual activity. They can vary in size, shape, and color among individuals, reflecting the diversity of human anatomy.