Electromagnetism is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force is carried by electromagnetic fields composed of electric fields and magnetic fields, and it is responsible for electromagnetic radiation such as light.
The modern understanding of electromagnetism was developed in the 19th century through the work of many scientists, including André-Marie Ampère, Michael Faraday, and James Clerk Maxwell. Maxwell's equations, published in 1865, provided a unified theory of electricity, magnetism, and light, and are one of the greatest achievements of modern physics.
Electromagnetism is one of the four fundamental forces of nature and is responsible for many of the phenomena we observe in our daily lives, from the functioning of electronic devices to the behavior of light. It has numerous applications in technology, including electric motors, generators, and telecommunications.