An electrical conductor is a material that can carry electricity.
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A material that does not conduct (or allow the 'passage' of) electricity is called an "insulator".
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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.
This is called a conductor.
It comes from the Greek word "electron." However, to the Greeks that word didn't mean what it does to us; it meant the material we call amber. It's called that because one of the first noticed electrical phenomena was that if you rubbed a piece of amber with a cloth you could build up a static charge and make a small spark.