High-power electronics is a specialized domain within electrical engineering and applied physics dedicated to the design, control, and application of solid-state electronic converters and systems operating at significantly high voltage and/or current levels. This field investigates the characteristics of high-power semiconductor devices, advanced converter topologies, thermal management techniques, and sophisticated control strategies necessary to efficiently and reliably manage electrical power flow in multi-megawatt to gigawatt applications, underpinning critical infrastructure like power grids, heavy industry, and high-energy research facilities.