What is a substance that allows electricity to pass through it easily?

Here are some examples of good conductors:

* Metaller: Copper, silver, gold, aluminum

* Water (with dissolved salts): Pure water is a poor conductor, but adding salts or other impurities makes it a good conductor.

* grafit: A form of carbon.

* plasma: A superheated gas with free electrons.

Let me know if you'd like more information about conductors!