A couple great books for laypersons have been written on this topic, most notably, those by Richard Feynman, who coined the term quantum electrodynamics, or QED, to describe this field of study. Let's look at the particle properties first. Light, or more properly, electromagnetic radiation, can be thought of as indivisible units called photons. These discrete packets of energy impinge on objects just like raindrops, only they are much faster and much smaller. Light through a vacuum travels at 300,000,000 meters per second.
Light also behaves like a wave, and, thus, every photon has a wavelength.
It is these different wavelengths of light that appear as color to our eyes. Different colors of light and indeed, all the different types of electromagnetic radiation have different wavelengths. For the purposes of our course, it's not important that we remember the electrical and magnetic part, but it is important that we recognize the types of electromagnetic radiation. Electromagnetic radiation is divided into different types according to an electromagnetic spectrum. The part of the electromagnetic spectrum that we see is known as visible light.