Reason For Appearance Of Noise In IP-Camera Image?

I am getting some noise in my IP-Camera. here are some horizontal lines which appear specifically in low-light conditions.

Can some one tell me the reason for this noise? I mean, is it because of the cameras sensor register configuration? Is it some power supply issue? or is it because of some other technical issue? if so can you please point out and elaborate?

Please find the image attached. The clear image is of High-light condition and the one with lines is of low light condition.

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