Here's why:

* Waves are disturbances that transfer energy through a medium without transferring matter.

* The particles in the medium oscillate (move back and forth) around their equilibrium position, transmitting energy.

Examples of waves:

* Sound waves: Air molecules vibrate back and forth, creating compressions and rarefactions.

* Water waves: Water molecules move in a circular motion, creating crests and troughs.

* Light waves: Electromagnetic fields oscillate, transferring energy without the need for a medium.

Let me know if you'd like to explore any of these wave types further!