This chapter presents recent advances in power semiconductors technology with special attention on wide bandgap (WBG) transistors. A short introduction to the state-of-the-art Silicon power devices is given, and the characteristics of the various SiC power switches are also described. Design considerations of gate and base-drive circuits for various SiC power switches along with experimental results of their switching performance are presented in details. Moreover, a section on applications of SiC power devices is also included, where the three design directions (high-efficiency, high switching frequency and high-temperature) that might be followed using SiC technology are shown. Last but not least, a short overview of Gallium Nitride transistors is presented in the last section of this chapter.