Conductors are materials that freely allow the flow of electrons with very little resistance.
Water, copper, and iron
Semiconductors are materials that do not allow electrons to flow freely but do not directory stop them either.
Silicon(Used in computer chips)
Insulators are materials that greatly impede or stop the flow of electrons with very high resistance.
Glass, dry air, and rubber
Compare conductors and Insulators
Conductors- nickel, nail, key, aluminum
Insulators - does not conduct electricity, rubber, clothes pin
Both - pencil
Compare Semiconductors and Insulators
Semiconductors - Silicon, mist air, cotton, wool
Insulators - wood, rubber, glass, dry air