The document discusses wirecut electrical discharge machining (WC-EDM) and electrochemical machining (ECM). For WC-EDM, it describes the working principle where electric sparks erode metal between a wire tool and workpiece submerged in dielectric fluid. It provides advantages like burr-free cuts and ability to cut hard metals. For ECM, it explains the electrolysis process where a voltage produces chemical reactions that remove metal from the workpiece. Applications include machining complex shapes and difficult materials.