Noise Canceling versus Noise Reduction Headphones

Noise-canceling headphones use tiny microphones that identify the noise or sounds outside the headphones and then work to cancel out the sounds. Noise-reduction headphones (also known as noise-isolation headphones) reduce sound by being a barrier through which sounds cannot pass. What does all this mean? And how do these two differ?
Comments on article "Noise Canceling versus Noise Reduction Headphones"
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bigoak Glad this information was helpful. 1/20/2006
Holly This provided exactly the information I was looking for. Thanks 1/2/2006
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