Heat sensors are devices that detect temperature changes in their environment. They work by measuring the amount of infrared radiation emitted by objects, which increases as temperatures rise. Commonly used in homes and industries, these sensors help monitor conditions to ensure safety and efficiency. For example, they can trigger alarms in case of overheating or control heating systems to maintain a comfortable temperature. These sensors come in various types, including thermocouples and infrared sensors. They are essential in applications like fire detection systems and smart thermostats, making them crucial for both safety and energy management in modern buildings.