Dielectrics are insulating materials or a very poor conductors of electric current.
Now you can see here in the diagram that , when the dielectrics are placed in an electric field , practically no current or very less current flows in them because , unlike metals , they have no loosely bound or free electrons that may drift through the material.
Instead electric polarization occurs also known as dielectric polarization.
Because of dielectric polarization the positive charges within the dielectric are displaced minutely in the direction of the electric field , and the negative charges are displaced minutely in the direction opposite to the electric field.
This separation of charge or polarization reduces the electric field within the dielectric.
;)
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