A Peltier cooler, also known as a thermoelectric cooler, is a solid-state device that uses the Peltier effect to transfer heat from one side of the device to the other. When electric current flows through the cooler, it creates a temperature difference, causing one side to absorb heat and become cold while the other side releases heat and becomes hot. Peltier coolers are commonly used in electronics to cool sensitive components, such as CPUs or sensors, where traditional cooling methods may not be practical. In cybersecurity, they can help prevent overheating in secure hardware, ensuring reliable operation and reducing the risk of thermal attacks.