Electromagnetic theory is a branch of physics that studies the behavior of electric and magnetic fields. It focuses on the interaction between electrically charged particles and magnetic fields, as well as the propagation of electromagnetic waves. Electromagnetic theory is a fundamental area of study in physics and plays a crucial role in understanding a wide range of phenomena, from the behavior of light and other electromagnetic waves to the operation of electronic devices. It is also the foundation for many technological applications, such as wireless communication, radar systems, and medical imaging.