Near-infrared (NIR) refers to a portion of the electromagnetic spectrum with wavelengths ranging from about 750 nanometers to 1,400 nanometers. This range is just beyond the visible light spectrum, making it invisible to the human eye. NIR is commonly used in various applications, including remote sensing, spectroscopy, and night vision technology. NIR light is absorbed and reflected differently by various materials, which allows scientists to analyze chemical compositions and physical properties. For example, in agriculture, NIR is used to assess plant health and soil conditions. Additionally, NIR imaging is utilized in medical diagnostics to monitor blood flow and tissue oxygenation.