+**Gain** is a measure of the [amplification](/wiki/amplification) of a signal, representing the ratio of its output to input strength. It quantifies how much a system, such as an [amplifier](/wiki/amplifier), increases or decreases an electrical or acoustic signal.
+## See also
+- [Signal](/wiki/signal)
+- [Decibel](/wiki/decibel)
+- [Attenuation](/wiki/attenuation)
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