Sound is a longitudinal wave.

Sound waves need a medium to travel (or to be transmitted or propagated).

When a sound wave is reflected by a large, hard and smooth surface, an echo is produced.

Sound waves are produced by the vibration of objects, e.g. drum, tuning fork or vocal cords.

Sound waves are propagated as  longitudinal waves which travel in a direction parallel to the direction of the vibrations.

Sound waves require a medium to travel, so they are classified as mechanical  waves.

 

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Links
Simulation of sound waves (longitudinal waves): https://www.geogebra.org/m/FDGVdN3J
Visualising sound waves in a medium: https://www.openscied.org/wp-content/uploads/2019/10/sound.html?version=v4