In light of the ever expanding research field of electromagnetic related studies, a simulation platform which is capable of solving multidisciplinary electromagnetic problems is indispensable. While dealing with challenging wireless product design or electromagnetic exposure safety assessment, numerical simulation can often provide insightful information which cannot be achievable by the current measurement techniques. The aim of this paper is to review the applications of numerical techniques in various electromagnetic-related research fields and to reveal the distinct advantages of employing state-of-the-art computational approaches.