Light

Light is made of billions of tiny energy particles called photons. These photons travel from one place to another in waves. Visible light is the subset of photons that move at a wavelength that we can see. Among the different photons that are in visible light, the ones that have the longest wavelength look red to us, and the ones that have the shortest wavelength look blue to us. All colors come from different wavelengths of light.
Light is simply a name for a range of electromagnetic radiation. Light or visible light is the portion of electromagnetic radiation that is visible to the human eye, responsible for the sense of sight.
Visible light has a wavelength in a range from about 380 or 400 nanometres to about 760 or 780 nm, with a frequency range of about 405 THz to 790 THz. In physics, the term light often comprises the adjacent radiation regions of infrared (at lower frequencies) and ultraviolet (at higher), not visible to the human eye.