An electromagnetic field is a physical field that permeates space and mediates the force of electromagnetism. It is composed of coupled electric and magnetic fields, which interact to exert forces on charged particles. Changes in an electric field produce a magnetic field, and conversely, changes in a magnetic field produce an electric field. These interactions are fundamental to the behavior of light, radio waves, and all forms of radiation. The study of these fields is central to physics and engineering, explaining phenomena ranging from the function of optical devices to the communication principles utilized by various technologies.