The ear is made up of three different parts. The outer ear is the part you can see, the middle ear is separated from the outer ear by the eardrum and contains tiny bones that amplify sound waves, and the inner ear is where sound waves are translated into electrical impulses and sent to the brain.
The ear canal cleans itself with a waxy secretion called cerumen. Cerumen is resistant to water, sticky (to trap dust) and migrates out of the ear canal to self-clean the ear.
Sometimes, the wax builds up and causes symptoms, including mild deafness and a sensation of fullness inside the ear. This condition is harmless and easily treated with the use of an ear syringe to squirt warm water into the ear canal and float out the wax plug.