The ear canal is a tube-like structure that connects the outer ear to the middle ear. It is approximately 2.5 centimeters long in adults and is lined with skin that produces earwax, which helps protect the ear from dust, debris, and microorganisms. The ear canal plays a crucial role in transmitting sound waves to the eardrum, which then vibrates and sends signals to the brain. The ear canal is part of the auditory system, which includes the outer, middle, and inner ear. It is shaped like an "S" to help filter and amplify sounds. Proper care of the ear canal is important, as blockages or infections can lead to hearing problems or discomfort.