Cuvettes are small containers used in spectrophotometric analysis to hold liquid samples for absorbance or transmission measurements. They are typically made of glass, quartz, or plastic, depending on the wavelength range of the analysis. Cuvettes are essential in UV-VIS spectrophotometers and are used to analyze the concentration and characteristics of chemical solutions, biological fluids, and food products. The choice of cuvette material ensures that the sample is properly contained and that accurate readings are obtained without interference from the container itself.