Here's why:

* Electromagnetic Radiation: Light is a form of electromagnetic radiation, which is a type of energy that travels in waves.

* Transverse Waves: Electromagnetic waves are transverse waves. This means the oscillations of the wave are perpendicular to the direction the wave travels. Imagine shaking a rope up and down; the wave moves horizontally, but the rope itself moves vertically.

* Electric and Magnetic Fields: Electromagnetic waves are made up of oscillating electric and magnetic fields that are perpendicular to each other. These fields are what interact with matter to create the effects we observe as light, such as vision.

Key Points:

* Spectrum: Light exists across a wide spectrum of wavelengths, from very long radio waves to very short gamma rays. The visible light we see is only a tiny portion of this spectrum.

* Speed: Light travels at a constant speed in a vacuum, which is approximately 299,792,458 meters per second (approximately 186,282 miles per second).

Let me know if you have any other questions!