Insulators are devices installed between conductors at different potential points or between conductors and grounding components, capable of withstanding the effects of voltage and mechanical stresses. There are many types of insulators, each with its own unique shape. Although the structures and appearances of different types of insulators vary significantly, they are both primarily composed of insulating components and connecting hardware.

Insulators are special insulating components that play a crucial role in overhead transmission lines. In earlier years, insulators were commonly used on utility poles. Over time, they evolved to include many disk-shaped insulators suspended at one end of tall, high-voltage transmission towers. These are designed to increase the creepage distance. Typically made from glass or ceramic, they are referred to as insulators.