Final answer:
Conductors are materials that allow charge to move through them easily, while insulators do not allow charge to move through them. Examples of conductors include metals and people, while examples of insulators include dry wood, PVC, rubber, ceramics, and porcelain.
Step-by-step explanation:
The materials that act as conductors and insulators are classified based on their ability to allow charge to move. Conductors are materials that easily allow charge to move through them, such as metals and people. Insulators are materials that do not allow charge to move through them, such as dry wood, PVC, rubber, ceramics, and porcelain. Water and green tree branches can act as both conductors and insulators depending on the circumstances.