Infrared refers to 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 based on their temperature. This property makes infrared technology useful in various applications, including remote controls, night vision devices, and thermal imaging cameras. Infrared radiation is divided into several regions, including near-infrared and far-infrared. Near-infrared is often used in fiber optic communications, while far-infrared is utilized in heating applications. Understanding infrared is essential for advancements in fields such as astronomy, meteorology, and medical diagnostics.