What does feedback mean?
Feedback is information returned about the effect of an action, intended to guide adjustment or improvement. It is central to how people learn at work, school, and in creative fields, where honest feedback on performance helps refine skills and outcomes. The term originated in engineering and physics, where it describes a system routing some of its own output back into its input: 'positive' feedback amplifies change while 'negative' feedback stabilizes a system. These scientific senses extend naturally to biology, economics, and climate science, where feedback loops explain phenomena from population growth to polar ice melt. As a mass noun, feedback is usually uncountable ('plenty of feedback'), and in everyday use its tone ranges from encouraging to critical depending on context. Few words serve equally well as practical career advice and as a cornerstone of cybernetics, which makes feedback both immediately useful and intellectually rich.
Evaluative information about the result of an action or piece of work, provided so that it can be improved.
"We welcome feedback from customers on our new checkout experience."
Usually uncountable; 'feedbacks' appears mainly in technical writing such as climate science.
In electronics and systems theory, the return of a fraction of a system's output signal to its input.
"Adding negative feedback reduced the amplifier's distortion dramatically."
A chain of cause and effect in which a system's outputs alter its subsequent behavior.
"Melting sea ice creates a warming feedback by exposing darker ocean water."
Feedback is normally an uncountable mass noun, so no plural is used in general contexts. A plural does appear in specialized scientific writing, especially climate science, where distinct mechanisms are counted individually.
"Climate models must account for multiple interacting feedbacks, including cloud cover and ice albedo."
The word was popularized by 1920s radio engineers describing the ear-splitting howl when a microphone picked up its own speaker output — that screech gave modern communication one of its most useful terms.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of feedback
The word combines two ancient English roots: 'feed', from Old English fēdan, meaning to nourish, and 'back', from Old English bæc. Though the parts are old, the compound itself is modern, emerging in early twentieth-century American electrical engineering to describe circuits returning output energy to their input. Radio pioneers of the 1920s made it famous through acoustic feedback, and Norbert Wiener's postwar work on cybernetics carried it into biology, computing, and the social sciences, where it remains a foundational concept.
How feedback is actually used
Feedback is almost always treated as an uncountable mass noun — you say 'a lot of feedback' rather than counting items. In workplace contexts it carries a constructive connotation, though 'negative feedback' can mean either criticism or the stabilizing kind in engineering, a genuine ambiguity worth noting.
Easily confused with feedback
Feedforward sends corrective signals ahead of a process rather than feeding output back into it, making it the conceptual opposite of feedback.