An electric conductor is a material that allows the flow of electric current to pass through. The electric conductivity will depend on the actual material of the conductor. If the material allows high mobility of free electrons this will make them great conductors of electricity.
Metals are some of the best conductors because there are spaces between their atoms which allows electrons to move. Of all the materials, the top three are silver, copper and aluminum.http://www.lyyrcable.com/bare-conductor/