Dielectric- Material such as glass ceramics polymers and paper are non-conducting materials. They prevent flow of current through them. Therefore they can be used for insulative purposes when the main function of non-conducting materials is to provide electrical insulation they are called insulators. When non-conducting materials are placed in an electric field. they modify the electric field and themselves undergo appreciable changes as a result of which they act as stores of electrical chages. When charge storage is the main function the materials are called dielectrics. For a material to be a good dielectric, it must bw an insulator. Hence any insulator is a dielectric.
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