Here's a breakdown:

* Insulator: A material that resists the flow of electric current. Electrons are tightly bound to the atoms and cannot move freely. Examples include rubber, glass, and plastic.

* Conductor: A material that allows electric current to flow easily through it. Electrons are loosely bound and can move freely. Examples include metals like copper, silver, and gold.

Let me know if you'd like more information on insulators or conductors!