Insulators primarily serve the function of providing electrical insulation. Insulating materials, also known as insulators, are designed to prevent the flow of electric current through them. Unlike conductors, which readily allow the movement of electrons, insulators have tightly bound electrons that are not easily free to move. This characteristic makes insulators valuable for creating barriers that prevent current leakage and electric shock hazards. Insulators are widely used in electrical and electronic systems to separate conductive elements and ensure the safe and efficient functioning of devices and circuits. By providing electrical insulation, insulators minimize the risk of short circuits, electrical interference, and other undesirable phenomena associated with the uncontrolled flow of electric current.
Mechanics 
Electrostatics