Noise Cancelling/Reduction When It Comes to Headphones

@ 2005/11/29
Noise-cancelling 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?

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