Feedback is a mechanism, process or signal that is looped back to control a system within itself. Such a loop is called a feedback loop. In systems containing an input and output, feeding back part of the output so as to increase the input is positive feedback (regeneration); feeding back part of the output in such a way as to partially oppose the input is negative feedback (degeneration).
This concept has many practical applications in our biology i.e. nervous and our endocrine system, and homeostasis
But also applies to economics, sociology, politics, thermodynamics, etc

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