What is the source of sound?

Answer: Sound is a vibration that travels as an acoustic wave through a material such as air, liquid, or solid. Sound is the receipt of such waves and their perception by the brain in human physiology and psychology.

Sound can come from both natural and artificial sources. Humans, animals, running water, avalanches, and a number of other things are just a few examples of natural sound sources.

Vehicles, factories, fans, explosions, etc. are examples of man-made sound sources.