The book covers the field of Biological Effects of Electromagnetic Fields in its entirety. Both high and low frequency areas are presented. In particular, the underlying mechanisms of interaction between EMF and biological systems, and the absorption patterns verification of theoretical models via real world measurement assessment are studied. Topics such as mathematical modeling of EMF absorption, Ion Cyclotron Resonance in Biological Systems, thermal and dissipation effects of mobile system radiation, effects on transmission lines and railway radiation, effects on the reproductive capacity of specific insects, on the immune systems, embryos, fetuses, blood parameters and behavior of rats are thoroughly covered as well as health risk assessment and therapeutic effects of EMF. Each topic is presented from the theoretical point of view, and experimental verification is shown in all cases possible. The book provides well-founded material for an overview of the major aspects of this important field in a tutorial format, which can pave the way in introducing courses in many universities.