What's inside a 3 pin plug wire

As usual all we know that commonly inside a wire.But we should know some basics to know for find out more complex wire. So let's look what's inside a 3 pin plug wire

Insulator : Protect wire from external injuries or accident. Like fire accident,chemical accident and     so on.

Inner Insulator : Protect the conductor form having contact each other.

Conductor : as we know,it allow flow current through conductor.