Usually when you plug your headphone a handset or mp3 player if you keep volume down on your handset and turn up the volume on the headphone, you'll notice that while your music gets louder there's a hissing sound that get louder as well, that hissing sound is called NOISE.
This is similar to a camera setting known as "ISO" and it function is to make images come out brighter.
If a picture is too dark increase your ISO, your digital camera can amplify the signal from the sensor, just as you can turn the volume up on your headphone to make music louder.
The downside is, just as with your music when it volumes turn up you get more noise so is the camera ISO, the higher you increase the more noise your image have.
Usually, you want to minimize noise so keep ISO down as much as possible.
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