Digital Cameras Noise

How does a digital camera to obtain higher-ISO noise louder?

I mean how is produced iso

The camera reaches higher ISO turning the gain on the sensor. It's hard to explain, but I'll use this comparison – now the whistle you get from speakers when you turn up the volume listen to a weak radio station? Digital noise can be compared to the forest. Camera makers have come a long way to reduce noise, and think it's best to increase the ISO instead of shooting an underexposed photo – I think it is I have less noise than the higher ISO than to correct underexposure.

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