Here's why:

* Conductors allow electricity to flow easily through them. They have free electrons that can move easily, carrying the electrical charge. Metals are good examples of conductors.

* Insulators resist the flow of electricity. They have tightly bound electrons that don't move freely. Rubber, plastic, and glass are examples of insulators.

Rubber bands are made of a material that is specifically designed to resist the flow of electricity. This is why they are used in things like electrical cords and other applications where it's important to prevent electric shock.