A vibrating's object pushes the molecules together and causes an area of compression

When a physical force presses inward on an object, causing it to become compacted, that is when compression force (also known as compressive force) happens. As a result of this process, the object's atoms and molecules move around in relation to one another.

The vibrating object causes compression as-

The air molecules in the immediate vicinity are pushed to the right, toward their nearest neighbor, as the vibrating string advances.
As a result, the air molecules to the string's right are confined to a narrow area of space.
Vibrating sources put in a medium result in sound.
A compression zone forms as the vibrating object advances outward, forcing the air layers together and creating a higher pressure area.

The difference between compression and rarefaction are-

A high-pressure area is produced when particles are drawn into a tiny area of space while a compression passes through a piece of the medium.
Additionally, a rarefaction tends to push particles apart as it passes through a region of a medium, which results in the formation of a low-pressure area.

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