Sound is a type of longitudinal or mechanical wave.
It can propagate through any medium in the form of compression and rarefaction.
Step 2: Visualisation of sound
When sound is emitted from a speaker, if we place our fingers on the sound source of the speaker, we can feel the vibration by the speaker caused due to the production of sound.
When traveling by car or bus, the engine of the vehicle vibrates which produces sound, and the people inside this vehicle are able to feel the vibration.
When an instrument is played, we can feel the vibration caused on the string or on the membrane, from where music is produced.