Infrared heat, often referred to simply as "infrared radiation" or "IR radiation," is a type of electromagnetic radiation with longer wavelengths than visible light but shorter wavelengths than microwaves. It falls within the electromagnetic spectrum, which also includes radio waves, microwaves, visible light, ultraviolet (UV) radiation, X-rays, and gamma rays. While some near-infrared radiation is close to the visible light spectrum and may be faintly visible to the human eye, most infrared radiation is invisible to us. This is why thermal imaging devices are needed to visualize it. Infrared radiation is often associated with heat because it carries energy. When it interacts with objects, it can cause the atoms and molecules within those objects to vibrate, which in turn generates heat. This property makes infrared radiation useful in a wide range of applications, including heating systems, cooking appliances, and industrial processes. Infrared heat has numerous practical applications. It is used in heating systems, including radiant heating in homes and industrial processes. Infrared lamps are used in medical therapy for conditions like muscle pain and joint inflammation. Infrared saunas use FIR to heat the body directly. Infrared grills and ovens are used for cooking, and IR detectors are used in various sensors and remote control devices.