Electrode

Imagine you're trying to attach a sticky note to a dusty wall, but it just won't stick because the surface isn't right. This is similar to how an electrode works in a circuit, where you need a conductive material to connect a metal part (like your sticky note) to a nonmetallic part (like the dusty wall) to facilitate electricity flow. Just as you might use tape to bridge the gap between the sticky note and the wall, an electrode serves as that crucial link, ensuring a proper connection between different materials for the flow of electrical current.