Here's why:

* Electrons: Copper has free electrons that can easily move throughout its structure.

* Electric Current: These free electrons allow for the flow of electrical current when a voltage is applied.

* Resistance: While copper does have some resistance to electrical flow, it's much lower than insulators.

In contrast, insulators are materials that resist the flow of electricity. They have tightly bound electrons that are difficult to move. Examples of insulators include rubber, plastic, and glass.