Superconductivity is a phenomenon that occurs in certain materials where the electric resistance of the material reaches exactly zero and the magnetic flux are expelled when it is cooled below a particular critical temperature. For most normal metallic conductors, the electrical resistance gradually decreases as temperature is lowered and even near absolute zero the conductor would still exhibit small amounts of resistance. In a super conductor, however the resistance drops abruptly to zero when the material is cooled below its critical temperature. In other words if you supply an electric current into a superconducting wire in a loop, then the current would persist indefinitely without any external power source. Superconductivity is a quantum mechanical phenomenon and is characterized by the Meissner effect.
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