Final answer:
Metals and salty water are conductors that allow electrical current to move through them easily. Insulators, on the other hand, do not allow electrical current to move through them easily.
Step-by-step explanation:
Substances such as metals and salty water are examples of conductors. Conductors allow electrical current to move through them easily. They have free electrons or ions that can move through the material, allowing charges to move relatively freely. For example, metals like copper and silver are good conductors of electricity because they have a large number of free electrons that can move through the material.
On the other hand, insulators do not allow electrical current to move through them easily. An insulator has very few or no free electrons or ions that can move through the material. Examples of insulators are rubber, glass, and plastic.