Electrical insulators are materials or devices that prevent the unwanted flow of electricity, ensuring that electrical currents travel along desired paths. They are crucial in electrical systems to support and separate conductors without allowing current to pass through themselves. Insulators are made from materials like porcelain, glass, or composite polymers and are used in various applications, including power lines, transformers, and circuit breakers. Their primary function is to provide mechanical support and electrical isolation, thereby enhancing the safety and efficiency of electrical networks.