Which of the following best describes insulators?

Insulators are materials that prevent the flow of electrical charge. This characteristic is crucial in numerous applications, such as in electrical wiring and components, where it is necessary to prevent unwanted current from flowing. Insulators work by having tightly bound electrons that do not move freely, making it difficult for charge carriers (like electrons) to pass through the material.

While conductors, like metals, allow electrical charges to move easily, insulators serve the opposite purpose by providing stability and safety in electrical systems. Understanding this property helps in various fields, such as engineering and electronics, where managing electrical circuits is essential. The other statements related to conductors, heat transfer, and material composition do not accurately reflect the definition and functionality of insulators.