Noise in electronic systems has come under intense scrutiny in recent times, especially since the amount of electronic information we process and transfer is enormous. Signal and noise are also important in biological systems. In communications within the body itself, in maintaining health and avoiding disease, signals are vital. If inappropriate signals are processed in the body, this may result in a disease. Further, biophysicists trying to understand life and death from a fundamental perspective, have formulated that 'signals' and their processing are compatible with life while noise and its proliferation constitutes death itself.
Any organized system requires transmission and interpretation of specific signals.
When signals breakdown, and when noise overtakes the signals, then chaos results and disorder prevails. If it is transitory, health could be restored. If it is permanent, then death might results. In fact, one might posit that life is a constant struggle to maintain a certain amount of signal in spite of ongoing noise. In other words, signal should always be larger than the noise.