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YourHomieAya
In this case, the particles of the medium move parallel to the direction that the pulse moves. This type of wave is a longitudinal wave.

Longitudinal waves are always characterized by particle motion being parallel to wave motion. A sound wave traveling through air is a classic example of a longitudinal wave.
sound is a longitudinal wave due to mode of propergation.
sound wave actually move by compression and rarefaction that is they shrink together (compression) and extend (rarefaction) like a rubber band but in this case air particles 

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