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A material that does not conduct (or allow the 'passage' of) electricity is called an "insulator".
This is called a conductor.
Every material conducts electricity, some materials are just better than others. The best conducter of electricity is silver, but silver is very expensive. Because of this, copper is used as it is a very good conductor of electricity but it is cheap.
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Materials that allow electricity to pass through are said to be good conductors. Conductors have free electrons allow for the flow of charged particles through the material resulting in an electric charge. Most metals are considered to be good conductors, some examples include copper, aluminum, silver, and gold.