Electrical insulators are designed to resist the flow of charges. This means charges do not flow easily in an insulator.

Here's why:

* Insulators have tightly bound electrons: The electrons in insulators are held tightly to their atoms, making it difficult for them to move freely.

* High resistance: Insulators have a high resistance to electrical current, meaning they oppose the flow of charges.

Examples of insulators:

* Rubber

* Glass

* Plastic

* Wood

In contrast, conductors have loosely bound electrons that can move freely, allowing for easy flow of electrical charges.