+Echo is a phenomenon where [Sound](/wiki/Sound) waves reflect off a surface and return to the listener, perceived as a distinct repetition of the original. Often heard in vast spaces like [Mountains](/wiki/Mountains) or within enclosed structures, it is a lingering resonance, a voice sent back.
+## See also
+- [Acoustics](/wiki/Acoustics)
+- [Reverberation](/wiki/Reverberation)
+- [Reflection](/wiki/Reflection)
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