Light is a form of energy that enables us to see all the things around us. Without light we can’t see because we don’t see objects at all but the reflection of light of the surfaces of them. We can see only things that give out a reflect light: the sun, a fire, a light bulb.
Watch the video: http://www.youtube.com/watch?v=fvKpqIS9k9Y
Visit the Greek school's website to learn more about light.