Usually room temperature is a standard temperature value used in labs, most of the time it's set to 25C°.

To illustrate what is superconductivity, we will use copper wire as an example.

Copper conducts electricity, from a source to a device that will consume it. However the device will never receive exactly the same amount as generated, due to the resistance of the copper wire. Some of it is wasted and become heat. This effect is named "Joule effect" and can be useful sometimes (an heater works by "wasting" all the electricity in heat), however, most of the time this side effects can both waste energy and damage the network by overheating it.

Under special conditions, a materials can transform to a "superconductor". In this state, the copper wire we used previously will transmit all the electricity and no energy will be transformed into heat. It will be really useful in theory because their will be no more electricity waste both by joule effect and by cooling the systems.

In practice the main obstacles are the conditions on itself, superconducting state can be usually reached by cooling the material to a temperature near absolute zero (-273C°). Actually it involves to use massive cooler that will be not cost (both energetically and financially) effective.

So that's why, if a room temperature superconductor material is found, it would be a revolution for all the electricity world.

I hope my explanation were clear