Here's why:

* Electromagnetic radiation is a type of wave that consists of oscillating electric and magnetic fields. It can travel through a vacuum (empty space) at the speed of light. Examples include:

* Visible light: What we see with our eyes.

* Infrared radiation: Felt as heat.

* Ultraviolet radiation: Causes sunburns.

* X-rays: Used in medical imaging.

* Gamma rays: The most energetic form of electromagnetic radiation.

* Other waves, like sound waves, need a medium (like air, water, or solids) to travel. They cannot travel through a vacuum.