Why does your cooling fan turns on then goes off?

The cooling fan in a device typically turns on to regulate temperature when internal components, like the CPU or GPU, generate heat during operation. Once the temperature drops to a safe level, the fan may turn off to conserve energy and reduce noise. This cycle can repeat as the system demands change, ensuring optimal performance and preventing overheating. If the fan behavior seems erratic, it could indicate a temperature sensor issue or dust buildup affecting airflow.