Electromagnetic Field Theory is a branch of physics that studies the behavior of electric and magnetic fields and their interactions with matter. It explains how charged particles create electric fields and how moving charges generate magnetic fields. This theory is fundamental to understanding various phenomena, including electricity, magnetism, and light. The theory is encapsulated in Maxwell's Equations, which describe how electric and magnetic fields propagate and interact. These equations form the foundation for many technologies, such as radio waves, telecommunications, and electromagnetic devices, making it essential for both theoretical and applied physics.