UV-Vis Spectroscopy is an analytical technique used to measure the absorbance of ultraviolet and visible light by a sample. It operates on the principle that different substances absorb light at specific wavelengths, allowing scientists to identify and quantify the presence of various compounds in a solution. This method is widely used in fields such as chemistry, biochemistry, and environmental science for applications like determining the concentration of a substance or studying chemical reactions. The results are typically displayed as a spectrum, which shows how much light is absorbed at each wavelength.