Final answer:
Insulators minimize leakage of electrical current and allow messages to be conducted more efficiently. Examples include smooth surfaces on high-voltage transmission lines and the myelin sheath on nerve axons.
Step-by-step explanation:
The insulators minimize leakage of the electrical current being carried along a conductor, thereby allowing messages to be conducted more efficiently. Smooth surfaces and large radii of curvature are used on high-voltage transmission lines to avoid leakage of charge into the air. One example of an insulator is the myelin sheath, a lipid layer that covers sections of the nerve axons, serving as an electrical insulator. The answer is Insulator.