Here are some examples of common insulators:

* Rubber: Used in electrical wires and appliance cords.

* Plastic: Found in many electrical components and housings.

* Glass: Used in light bulbs and other electrical applications.

* Wood: A common building material that can be used as an insulator.

* Ceramic: Found in electrical insulators and circuit boards.

* Air: A good insulator, which is why we can safely handle electrical wires that are not covered with insulation.

The reason insulators conduct poorly is that they have very few free electrons to carry an electric current. Their electrons are tightly bound to their atoms, making it difficult for them to move freely.