Sound is a longitudinal mechanical wave. Mechanical wave means it needs physical medium to travel (air, water, some particles of matter), longitudinal means that unlike water waves the oscilations move in the direction of the wave, whilst with water as mentioned the water surfaces oscilates up and down thus perpendiclar to the direction of the wave.A slinky can demostrate this rather well.
Image taken from: https://www.researchgate.net/figure/Illustration-of-a-transverse-wave-and-a-longitudinal-wave_fig6_327447483
Check out the video for demonstration
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