Here's why:

* Electromagnetic waves don't need a medium: Unlike sound waves or water waves, which need a medium like air or water to travel, electromagnetic waves can travel through the vacuum of space.

* They are made of oscillating electric and magnetic fields: Electromagnetic waves are formed by the interaction of electric and magnetic fields that oscillate perpendicular to each other and to the direction of wave propagation.

Examples of electromagnetic waves include:

* Light: Visible light is a part of the electromagnetic spectrum.

* Radio waves: Used for communication.

* Microwaves: Used in ovens and communication.

* X-rays: Used in medical imaging.

* Gamma rays: High-energy radiation emitted by radioactive substances.