Here's why:

* Longitudinal waves have vibrations that travel in the same direction as the wave itself. Think of a spring: if you push one end, the compression (or rarefaction) travels along the spring.

* Transverse waves have vibrations that are perpendicular to the direction of wave motion. Imagine a rope tied to a wall; if you shake the rope up and down, the wave travels horizontally, but the rope itself moves up and down.

Examples of Longitudinal Waves:

* Sound waves: Sound travels through air, water, or solids by compressing and expanding the medium.

* Seismic P-waves: These are the primary waves that travel through the Earth during an earthquake.