Here's why:

* Transverse waves: The particles in a transverse wave move perpendicular to the direction the wave travels. Imagine a rope tied to a wall. If you shake the rope up and down, the wave will travel along the rope, but the rope itself is moving up and down (perpendicular to the direction of the wave).

* Longitudinal waves: In a longitudinal wave, the particles move back and forth parallel to the direction the wave travels. Think of a spring. If you push on one end, the compressions and rarefactions (spaces) travel down the spring, and the coils of the spring move back and forth along the same direction as the wave.

Examples of Transverse Waves:

* Light waves

* Electromagnetic waves

* Waves on a string

Let me know if you'd like to know more about waves!