A burette is a long, vertical, graduated glass tube with a narrow tip at the bottom. It is fitted with a stopcock (tap/valve) that controls the flow of liquid. The tube is marked with graduation lines (usually in milliliters) for accurate measurement, as seen up to 50 ml in the image. It is typically made of high-quality borosilicate glass, ensuring chemical resistance and durability. Burettes are widely used in volumetric analysis and titration processes, where precise addition of a solution is required. The stopcock allows the user to release the liquid drop by drop, ensuring high accuracy in experiments.