What is returning a part of the output back to its input known as?

The process of taking a portion of the output of a system and feeding it back into the input is known as feedback. Feedback can be utilized in various circuits, including operational amplifiers, to enhance stability, improve linearity, and control gain. It is an essential concept in control systems and electronics, where it supports the regulation of output and ensures that the system behaves as desired.

Saturation refers to the state when a device is pushed to its limits, usually resulting in distortion or inability to provide more output. Degeneration typically involves reducing gain in amplifier circuits by using negative feedback to control distortion and noise. Amplification is simply the process of increasing the amplitude of a signal. Each of these concepts plays an important role in electronics but feedback specifically addresses the relationship between output and input to create a self-regulating system.