Materials that pass current easily are called conductors.

Here's why:

* Conductors have loosely bound electrons that can move freely throughout the material. This allows for the flow of electrical current.

* Insulators, on the other hand, have tightly bound electrons and resist the flow of current.

Examples of conductors include:

* Metals: Copper, gold, silver, aluminum

* Some liquids: Salt water, acid solutions

* Some non-metals: Graphite (a form of carbon)

Let me know if you'd like to learn more about conductors and insulators!