What type of material conducts current under certain conditions?

The correct answer is semiconductor because this type of material has unique properties that allow it to conduct current under specific conditions, unlike conductors, which always allow current flow, and insulators, which resist current flow under normal circumstances. Semiconductors, such as silicon, can conduct electricity more efficiently when exposed to certain conditions, such as higher temperatures or when doped with other materials. This ability to switch between conducting and insulating states makes semiconductors essential in modern electronics, particularly in devices like transistors and diodes.

In contrast, superconductors are materials that can conduct electricity without resistance at very low temperatures, but they do not function under typical conditions used for most applications. Conductors, such as metals, provide a consistent path for current at all times, while insulators like rubber and glass do not allow electrical flow under normal conditions, making them unsuitable for this question.