The pinna is the visible part of the ear that is located on the outside of the head. It is made of cartilage and skin, and its primary function is to collect sound waves and direct them into the ear canal. The shape of the pinna helps to enhance the ability to hear sounds from different directions. In addition to its role in hearing, the pinna also contributes to the overall appearance of the ear. It varies in size and shape among individuals, influenced by genetics and environmental factors. The pinna is an important part of the auditory system, which includes other components like the ear canal, tympanic membrane, and cochlea.