Non-metallic conductors are materials that can conduct electricity but do not contain metals. Common examples include certain types of carbon, graphite, and conductive polymers. These materials are often used in applications where lightweight or flexible properties are needed, such as in electronic devices and batteries. Unlike traditional metallic conductors like copper or aluminum, non-metallic conductors can offer advantages like corrosion resistance and lower weight. They are also used in specialized applications, including solar cells and sensors, where their unique properties can enhance performance and efficiency.