Materials that current can pass through easily are called conductors. Here are some common examples:

* Metals: Copper, silver, gold, aluminum, iron, and nickel are excellent conductors.

* Water: Pure water is a poor conductor, but impurities like salts, acids, and bases make it much more conductive.

* Graphite: This form of carbon is a good conductor.

* Plasma: This is a superheated gas where electrons are stripped from atoms, making it extremely conductive.

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