how sound are produced

by vibration

Sounds are nothing more than disruptions in the air. They can happen with varying degrees of intensity (amplitude) and frequency (frequency). Amplitude correlates with loudness, and frequency correlates with pitch (how high or low the sounds are). Sound waves can also vary in complexity, giving rise to a given sound's timbre. Sound can be transmitted by materials other than air.
Sounds are produced when objects vibrate. As they vibrate, particles of air are pushed together in a particular pattern. this pattern is a sound wave. Sound energy travels in compressional waves. In this, matter vibrates in the same direction as the energy travels through it.

all sound is produce by vibration that create waves that move outward from the source

 When an object vibrates, it forces the neighbouring particles of the medium to vibrate. These vibrating particles then force the particles adjacent to them to vibrate. In this way, vibrations produced by an object are transferred from one particle to another till it reaches the ear.