There are three parts of the ear: the outer, middle and lower ear. These parts work together to capture the vibrations of sound that travel through the air. When you hear something such as your best friend's voice calling your name. The vibrations that make up your name travel through your ear canal to you ear drum. the ear drum is what magnifies the vibrations. the waves travel across three little bones, into your ear to the snail shell looking organ called the cochlea. Inside the cochlea is a part that acts as the "reader" of the sound. The cochlea is covered in little hairs that read the sound of your name. Once the Cochlea has done its job, then the sound goes to your brain and you recognize that your friend is calling your name. This is why it is bad to listen to loud music or any sort of sound without hearing protection. Loud noises cause the little hairs to die and weakens your ear drum. So even if ear plugs are annoying, it's better to be safe with protection!
Image courtesy of http://bbs51.org/parts-of-the-ear/
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