Conductors are materials that allow electrons to flow through them easily. Insulators are materials that do not allow electrons to flow through them easily. Some examples of conductors include metals, such as copper and aluminum. Some examples of insulators include rubber, plastic, and glass.

When an electric current is passed through a conductor, the electrons in the conductor are forced to move in one direction. This movement of electrons is what creates the electric current. In an insulator, the electrons are not able to move freely, so an electric current cannot be passed through an insulator.

The resistance of a material is a measure of how difficult it is for an electric current to pass through the material. Conductors have low resistance, while insulators have high resistance.