Would someone explain me superconductivity?

On the other hand, there is a class of properties that are independent of the underlying material. For instance, all superconductors have exactly zero resistivity to low applied currents when there is no magnetic field present or if the applied field does not exceed a critical value. The existence of these "universal" properties implies that superconductivity is a thermodynamic phase, and thus possesses certain distinguishing properties which are largely independent of microscopic details.

Would someone explain me superconductivity IN ATOMIC WORLD? if this doesnt belong in quantum physics im sorry admin

And as a guide, please read this:

http://www.physicsforums.com/blog.php?b=3588

Zz.