Electromagnetic (EM) wave also known as Electromagnetic Radiation is a self-propagating wave energy that travels at the speed of light in the form oscillating electric and magnetic fields perpendicular to each other. Electromagnetic Wave is generated when electric particles are accelerated though matter which generates electromagnetic radiation. Electromagnetic waves can travel through vacuum. Accelerating electric charge can generate electromagnetic waves and wise versa, electromagnetic waves can induce electric charge back in physical matter. Since it doesn’t need physical matter to propagate, at the speed of light, it’s the best to be used for communication across the world and in space.
