Infrared light is a type of electromagnetic radiation that has longer wavelengths than visible light, typically ranging from about 700 nanometers to 1 millimeter. It is not visible to the human eye but can be felt as heat. Infrared light is commonly used in various applications, including remote controls, thermal imaging, and night vision technology. This form of light is emitted by warm objects, such as the Sun and human bodies. Infrared radiation plays a crucial role in many scientific fields, including astronomy, where it helps in studying celestial bodies that emit heat rather than visible light.