Can you explain this to me in simpler terms?

When a direct current of electric charge flows through a wire, electrons drift through the material. Ordinarily, the wire would seem electrically neutral, with no net positive or negative charge, because the wire has about the same number of protons and electrons. But if you put another wire with a direct current next to it, the wires attract or repel each other, depending on the direction in which the current is moving.