Insulators are devices installed between conductors at different potential points or between conductors and grounding components, capable of withstanding voltage and mechanical stress. There are numerous types of insulators, each with varying shapes. Although the structures and appearances of different types of insulators differ significantly, they are both primarily composed of insulating components and connecting hardware.

Insulators are specialized 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 mounted at the end of tall, high-voltage transmission towers to increase the creepage distance. Typically made of glass or ceramic, these are referred to as insulators.