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In order to perform an electromagnetic simulation in any of [[EM.Cube]]'s computational modules, you need to excite your physical structure using some kind of source. In most cases, you can define more than one source if necessary. In [[EM.Tempo]], a source pumps energy into your FDTD computational domain in the form of a temporal waveform varying as a function time. In the MoM-based modules, [[EM.Picasso|EM.picasso]] and [[EM.Libera]], a source provides the "right-hand-side (RHS)" vector of the MoM linear system resulting from the integral equation formulation of your boundary value problem. In EM.Illuumina, a source is used to illuminate your surfaces. In [[EM.Terrano]], a source acts as a transmitter that launches the broadcast signal into the free space. In [[EM.Ferma]], you need either an electric or magnetic source to set the boundary conditions for the Laplace equation or provide the source term for the Poisson equation.