In transverse waves, displacement of the medium is perpendicular to the direction of propagation of the wave while in longitudinal waves, displacement of the medium is parallel to the direction of propagation of the wave.
What is sound wave?
A sound wave is a result of compression and rarefaction, by which sound is propagated in a material medium such as air.
A sound wave can't be propagated without medium. Sound doesn't travel in vacuum.
When displacement of the medium is perpendicular to the direction of propagation of the wave is called transverse waves.
When displacement of the medium is parallel to the direction of propagation of the wave is called longitudinal waves.
Thus, the difference is only due to the direction of propagation.
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