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 with varying shapes. Although insulators of different types have considerable differences in structure and appearance, they are both primarily composed of insulating parts 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 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.