Electromagnetism, also known as Electricity & Magnetism or E&M, is one of the fundamental forces of nature. It can be described by the beautiful Maxwell’s Equations:
∇⋅E=4πρe∇⋅B=0∇×E=−1c∂B∂t∇×B=1c∂E∂t+4πcJeThough seemingly simple, these equations have profound consequences, especially in the presence of materials (which require a slightly more sophisticated formulation).