+An **acoustic wave** is a ripple of energy, a disturbance that travels through a medium. It carries no matter, only the vibration, creating what we perceive as [Sound](/wiki/sound) or even silent [Ultrasound](/wiki/ultrasound).
+## See also
+- [Vibration](/wiki/vibration)
+- [Frequency](/wiki/frequency)
+- [Wavelength](/wiki/wavelength)