whats the difference between a insulator and a dielectric...?

Hi! Shilinpm

 

Dielectric materials can store energy by getting polarized, whereas some other materials which are insulators cannot be polarized. Again dielectric materials do not conduct electric current like any other insulator.

 

So in short, all dielectric are insulators, but all insulators are not dielectric materials.
 

Hope this is clear to you!

Cheers!!