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This is a book about computer simulations of the EMC of electronic systems. EMC is concerned with the emission of electromagnetic disturbances and the immunity against them. Designing for EMC requires addressing multiple scales in geometry, signal amplitudes, and frequencies, making EMC simulation a challenging task. Despite these challenges, EMC simulation has become a success story. For many leading companies, it has evolved into an indispensable asset in their design processes. This success began when engineers recognized the impracticality of computing entire models as a single entity using a single method. Instead, EMC models of electronic systems, much like t he systems themselves, are assembled from component models. Each component model has its own specific description— it could be a circuit model, measurement data, or an EM model derived from geometric data, with multiple approaches available to compute its properties. There are countless ways to construct an EMC simulation model, a process we refer to as modeling. In the fast-paced environment of competitive industrial design, identifying the most efficient modeling approach is crucial. However, modeling through simulations is not a s imple push-button solution. Achieving reliable and fast simulations requires a deep understanding of the physical effects being modeled and the numerical methods used to solve them. This book combines information about the domains that a simulation engineer should master, in order to successfully model and simulate EMC phenomena. These domains are summarized in Fig. 1.1. Each domain in Fig. 1.1 represents a key domain of knowledge cove red in this book: Electromagnetic Compatibility (EMC) The EMC domain defines the scenarios simulated in this book, focusing on challenges EMC engineers face daily. Topics include emission, susceptibility, crosstalk, and signal and power integrity. Additionally, we explore the modeling of various EMC test methods through simulation.