Insulators are devices installed between conductors at different potential levels or between conductors and grounding components, capable of withstanding voltage and mechanical stress. There are numerous types of insulators, each with varying shapes. Although insulators of different types have significant differences in structure and appearance, they are all composed of two main parts: the insulating component and the 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 hanging at one end of tall, high-voltage transmission towers. These are designed to increase the creepage distance. Typically made of glass or ceramic, they are referred to as insulators.