Conductors are materials that allow electric current to flow easily through them. They have a low resistance to the flow of electrons. Examples of conductors include:

* Metals (copper, silver, gold)

* Graphite

* Electrolytes (solutions containing ions)

Insulators are materials that resist the flow of electric current. They have a high resistance to the flow of electrons. Examples of insulators include:

* Rubber

* Glass

* Plastic

* Air

* Wood

Resistance is a measure of how much a material opposes the flow of electric current. The higher the resistance, the more difficult it is for current to flow.

In summary:

* Conductors have low resistance.

* Insulators have high resistance.

This difference in resistance is the fundamental reason why conductors are used in electrical wiring and circuits, while insulators are used to prevent electric current from flowing where it is not desired.