"Sound" existing in this world is created by vibration of objects such as air and water. A site that can interactively know such "sound formation" is "Let's Learn About Waveforms"is. On this site, it ...
An audio waveform theoretically comprised of an infinite set of harmonically related sine waves, as shown under Law of Superposition. It is often used in sound synthesis. See also: Fourier Theorem, ...