The body part primarily used for hearing is the ear. The ear consists of three main sections: the outer ear, middle ear, and inner ear. Sound waves enter through the outer ear and travel down the ear canal, causing the eardrum to vibrate. These vibrations are transmitted through tiny bones in the middle ear to the cochlea in the inner ear, where they are converted into electrical signals sent to the brain. The ear also plays a crucial role in balance and spatial orientation, working in conjunction with the vestibular system. Overall, the ear is vital for auditory perception and communication.