A volumetric flask is a laboratory glassware used for precise measurement of liquid volumes. It has a long neck and a flat bottom, allowing for accurate dilution and preparation of solutions. The flask is marked with a specific volume line, ensuring that the liquid can be measured accurately to that mark. These flasks are typically made of glass or plastic and come in various sizes, commonly ranging from 10 mL to 2 L. They are essential tools in chemistry and are often used in conjunction with other equipment like pipettes and burettes for experiments and analyses.