Near-infrared (NIR) refers to a specific range of wavelengths in the electromagnetic spectrum, typically from about 750 nanometers to 1,400 nanometers. This range is just beyond the visible light spectrum, which means it cannot be seen by the human eye. NIR is commonly used in various applications, including telecommunications, remote sensing, and medical imaging. In agriculture, near-infrared technology helps in assessing plant health and soil conditions. Devices that utilize NIR can analyze the chemical composition of materials, making it valuable for food quality control and environmental monitoring. Overall, NIR plays a crucial role in both scientific research and practical applications.