Electrical insulation is a processing technology and group of materials aimed at preventing or limiting the flow of electric current, thereby preventing short circuits between conductors, electric shock, isolating signals, and providing thermal protection. It offers essential functions in all electrical and electronic equipment, such as motors, transformers, cables, printed circuit boards, and semiconductor packages. Materials used include epoxy resins, polyimides, ceramics, glass, and mica, with properties such as dielectric constant, dielectric breakdown strength, heat resistance, and moisture resistance being crucial. Processing methods are diverse, including injection molding, extrusion molding, casting, lamination, varnish impregnation, resin coating, and thin film formation, requiring optimal material selection and precise processing according to the application.