Dielectrics are also called insulators because there is no possibility of electric current passing through these materials.
Dielectric substances are widely used in everyday life, as well as in electrical circuits, such as capacitors, for example. These are electrical circuit elements whose main function is to store electrical charges and can take different forms. They basically consist of two parallel plates that when subjected to a potential difference, the passage of electric current occurs. In order to prevent these plates from coming into contact, a dielectric material is placed between them.
Although they do not conduct electric current, if a dielectric material is subjected to an electric field of very high intensities, it can become a conductor. But the insulating materials that are placed between the plates of capacitors, for example, are very resistant to this factor, which means that it is practically impossible to make the insulator between their plates become a conductor.