Infrared radiation is a type of electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves. It is commonly associated with heat, as objects emit infrared radiation when they are warm. This form of radiation is invisible to the human eye but can be felt as warmth on the skin. Infrared radiation is used in various applications, including remote controls, thermal imaging cameras, and night vision devices. It plays a crucial role in everyday technologies, such as infrared heaters and fiber optic communication, making it an essential part of modern life.