High voltage refers to electrical energy at a level significantly higher than standard household voltage, typically above 1,000 volts for alternating current (AC) and 1,500 volts for direct current (DC). It is used in various applications, such as power transmission over long distances, where it helps reduce energy loss. High voltage systems require special equipment and safety measures to prevent accidents. Components like transformers and insulators are designed to handle these elevated levels safely. Proper training and protective gear are essential for workers who operate in high voltage environments to ensure their safety.