Electrical insulation refers to materials that prevent the flow of electric current. These materials are essential in electrical systems to protect users from electric shocks and to ensure that electricity flows along intended paths. Common insulating materials include rubber, plastic, and glass, which are used in wires, cables, and electronic devices. Insulation works by providing a barrier that resists the movement of electrons. This property is measured in terms of dielectric strength, which indicates how much voltage an insulating material can withstand before it breaks down. Proper insulation is crucial for the safety and efficiency of electrical equipment.