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Feedback is the title of several rock and roll albums, the best known of which are the 1972 album by Spirit and the 2004 album by Rush.
In negative feedback, the feedback tends to reduce a change in the output, acting as a stabilising force and leading to stable outputs.
In positive feedback, a small change in the output is increased by the feedback, leading to the output rapidly moving to its extreme positive or negative limit.
In communications, feedback is a type of message which a source transmits in response to having received a message.
Feedback is observed or used in various areas dealing with complex systems, such as engineering, economics and biology.
Negative feedback is often deliberately introduced to increase the stability and accuracy of a system, as in the feedback amplifier invented by Harold Stephen Black.
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