Feedback
From Conservapedia
When a signal is looped back into a system, the resulting effect is called feedback.
Feedback can be positive or negative, but these terms do not imply whether the feedback is wanted or not.
Positive feedback
In general, feedback is positive when the reaction of the system goes in the same direction as the initial signal. The most likely best-known example for this is audio feedback. An example of a non-technical feedback loop is the spreading of a rumor in the mass media: One person makes a plausible claim and other sources repost it, causing yet more sources to post it.
Negative feedback
When the system reacts to a signal by going into the opposite direction, there is a negative feedback. For example, a thermostat reacts to temperature changes by countering the observed trend: When the temperature sinks under the lower border, it increases the temperature; and when the temperature is above the upper border, it reduces the temperature.
