Electricity

Conductor

conductor definition. A material through which electric current can pass. In general, metals are good conductors. Copper or aluminum is normally used to conduct electricity in commercial and household systems. (Compare insulator.)
copper wire
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Semiconductor

a substance, as silicon or germanium, with electrical conductivity intermediate between that of an insulator and a conductor : a basic component of various kinds of electronic circuit element (semiconductor device) used in communications, control, and detection technology and in computers.
computer chip
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Insulator

An electrical insulator is a material whose internal electric charges do not flow freely, and therefore make it nearly impossible to conduct an electric current under the influence of an electric field.
glass
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Comparing

an insulator is something that stops currents, semiconductors are in the middle of insulator and conductor,Conductors are things that give currents no resistence