The labia majora are the outer folds of skin that surround and protect the female genitalia. They are part of the vulva, which includes other structures such as the labia minora, clitoris, and vaginal opening. The labia majora are typically covered with pubic hair and vary in size, shape, and color among individuals. These structures serve several functions, including providing cushioning and protection for the internal reproductive organs. They also play a role in sexual arousal and can become engorged with blood during arousal, contributing to sensitivity in the area.