What are ionic compounds? Why do ionic compounds not conduct electricity in the solid-state?

The compounds which are formed by the transfer of electrons from metals to non-metals are called Ionic compounds. Ionic compounds are compounds consisting of ions.

Example of ionic compound: Sodium chloride, NaCl

 Ionic compounds cannot conduct electricity in the solid-state as their ions are held in fixed positions and cannot move. Ionic compounds conduct electricity when molten state because their ions are free to move from place to place.