Visible light is light that can be perceived by the human eye.
When you look at the visible light of the sun, it appears to be colorless , which we call white . This is because white light is not the light of a single color, or frequency. Instead, it is made up of many color frequencies. When sunlight passes through a glass of water to land on a wall, we see a rainbow on the wall. This would not happen unless white light were a mixture of all of the colors of the visible spectrum.