Sound is the movement of energy through substances in longitudinal (compression/rarefaction) waves. Sound is produced when a force causes an object or substance to vibrate — the energy is transferred through the substance in a wave. Typically, the energy in sound is far less than other forms of energy.
"Sound is a form of mechanical (potential and kinetic) energy. It is not any form of electromagnetism, including light. It is not made up of particles, so it cannot be a form of radiation."
