The electromagnetic radiation travels at c = 3 x 108 m/s in vacuum.
Examples of Electromagnetic Radiation:
AM and FM radio waves, TV signals, cell phone communication links, microwaves, infrared radiation, light, X-rays, Gamma rays.
Uses of Electromagnetic Waves:
(i) One-way and two-way communication systems
(iii) Cooking (with microwaves)
(iv) Medical imaging (X rays)
(v) Night vision (infrared), and
(vi) Astronomy (radio, gamma, UV, visible, IR, microwave)
All that we experience through our eyes is conveyed by electromagnetic radiation.