Computational electromagnetics is a field of study and a methodological approach focused on the numerical simulation and analysis of electromagnetic field phenomena. It employs computational techniques and algorithms, such as the Finite-Difference Time-Domain (FDTD), Finite Element Method (FEM), and Method of Moments (MoM), to model electromagnetic field distributions and multi-physically coupled effects within complex technological and biological systems. This approach is crucial for investigating systems where analytical solutions are intractable, providing essential tools for the design, analysis, and optimization of devices and systems involving electromagnetic energy transport and conversion.