The infrared spectrum is a part of the electromagnetic spectrum that lies between the visible light and microwave regions. It consists of wavelengths ranging from about 700 nanometers to 1 millimeter. Infrared radiation is commonly associated with heat, as objects emit infrared radiation based on their temperature. Infrared spectroscopy is a technique that utilizes the infrared spectrum to identify and analyze materials. By measuring how a substance absorbs infrared light, scientists can determine its molecular structure and composition. This method is widely used in chemistry, biology, and materials science for various applications, including chemical analysis and quality control.