IR, or Infrared Radiation, is a type of electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves. It is commonly used in various applications, including remote controls, thermal imaging, and night vision devices. IR can be detected as heat, making it useful for measuring temperature and identifying heat sources. In the context of international relations, IR refers to the study of interactions between countries, organizations, and other global actors. It encompasses various theories and practices that explain how nations cooperate, compete, and address global issues such as security, trade, and human rights. Understanding IR helps analyze the complexities of global politics.