Conductors carry electrical current but have resistance, so you lose power to heat. Superconductors have effectively zero resistance so you don't lose power as they conduct.

We can make superconductors, but they only work at extremely cold temperatures, if they get too hot they turn back into bad conductors. This new material might be able to superconduct at room temperature, which means zero loss conductors without expensive bulky and complicated cooling systems. There are many cool things that can be done with zero loss conductors.