Conductor
An electrical conductor is any substance through which electrical current can flow. Since electrical current is a process involving the flow of electrons, how well a material conducts electricity depends on its atomic structure and chemical consistency.
Conductivity also depends on how strong the bond is between electrons and the metallic ions with which they are associated. The weaker the bond, the better the conductor. All metals are conductors (copper is a particularly good one). Plastics are not good conductors but make good insulators. Semi-conductors are materials whose ability to conduct electricity can be controlled.
Super-conductors, under special conditions, offer no electrical resistance, so electricity can flow indefinitely. More generally, a conductor refers to a material that can transmit electricity, heat or sound.