Visible light is created when electrons that are located inside atoms return to their ground state after being in an excited state, according to the University of Hartford. Light is radiant energy, meaning it is electromagnetic radiation that can be seen with the human eye.
Light also provides us with the ability to see. The properties of light include intensity, frequency, propagation direction and polarization, and the speed of light in a vacuum is one of the most fundamental constants that can be found in nature. Light often refers to the electromagnetic radiation of any type of wavelength, whether it can be seen with the visible eye or not.