Copper, silver, and aluminum let charge move through them easily, while plastics, glass, ceramics, and wood do not. What are these two classes of material called?

1. Materials that let charge move through them easily are called conductors. 2. Materials that do not let charge move through them are called insulators. 3. Copper, silver, and aluminum are named as conductors, and plastics, glass, ceramics, and wood are named as insulators. _Source: OpenStax Physics (CC BY 4.0), Ch 18 "Static Electricity", section Conductors and Insulators_