All materials have some resistivity, meaning that whenever electricity flows through them, they heat up and some electrical energy is wasted as heat.
The resistivity of many materials can be lowered by cooling them down. If cooled to below a 'transition temperature' their resistivity disappears entirely and they become a superconductor. Without any resistance, none of the electrical energy is wasted as heat.
Most metal conductors have transition temperatures below 10 K. Such low temperatures are tricky and expensive. However some metal oxides have been developed to superconduct at 140 K which is much easier.
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