A superconductor is a special type of material that conducts electricity without resistance. That means that electrons (tiny particles with negative charge) can flow very easily through the material. This can be achieved only at very low temperatures. The temperature at which a material becomes superconducting varies from material to material. Not all materials are superconductors. Another property of superconductors is the Flux Trapping Effect, which can cause a rare earth magnet to float above a cooled superconductor.