conductor

noun

a substance or object that allows energy (such as heat or electricity) to move through it efficiently. Examples include copper and steel.

In physics, a conductor is a material or substance that allows electrons to flow easily. This is in contrast to insulators, which do not allow the easy flow of electrons. Conductors are essential in electrical circuits, as they allow the flow of electricity from one point to another. Examples of conductors include metals like copper, aluminum, silver, and gold.