Light is considered a form of electromagnetic radiation because it exhibits all the properties of electromagnetic waves. Electromagnetic radiation is a form of energy that is produced by oscillating electric and magnetic fields.
Light consists of electric and magnetic fields that oscillate perpendicular to each other and propagate through space as waves. These waves have both an electric component and a magnetic component, which are perpendicular to each other and to the direction of wave propagation.
Like other forms of electromagnetic radiation, light also travels at a constant speed in a vacuum (the speed of light), and it can be reflected, refracted, diffracted, and absorbed. Furthermore, the energy of a light wave is proportional to its frequency, and the frequency of light can vary over a continuous range, creating a spectrum of different colors.
Therefore, light is considered a form of electromagnetic radiation because it shares all the fundamental properties and characteristics of electromagnetic waves, such as oscillating electric and magnetic fields and the ability to travel through space as waves.