Question

what is the main difference in conductor and superconductor ?

Answer 1

In an ideal conductor the resistance is ideally zero. A current will continue to flow through it even when the power source is removed. In an ordinary conductor the current dissipates in the resistance, when the power is removed.

In a superconductor the resistance goes to to zero when the conductor goes to superconducting phase. The current keeps flowing even when the power source is removed.

But the difference between an ideal conductor and a superconductor is that a superconductor shows Meissner effect.

Suppose a conductor is placed in a magnetic field, the magnetic line of force pass within the conductor also.

When the conductor is made to pass over to superconducting phase, by cooling it below its critical temperature, the magnetic field is expelled from within the conductor. This is Meissner effect.

A superconductor shows Meissner effect whereas an ideal conductor does not show Meissner effect.

Answer 2

Superconductors are materials that conduct electricity with no resistance. This means that, unlike the more familiar conductors such as copper or steel, a superconductor can carry a current indefinitely without losing any energy.
Hope it will help u dear friend