Thermal imagers are devices that detect infrared radiation, which is emitted by all objects based on their temperature. They convert this radiation into visible images, allowing users to see heat patterns. This technology is commonly used in various fields, including building inspections, firefighting, and medical diagnostics. These devices work by using sensors to capture the infrared energy and create a thermal image, often displayed in different colors to represent varying temperatures. Thermal imagers can help identify issues like heat loss in buildings or locate hotspots in electrical systems, making them valuable tools for maintenance and safety.