A millilitre (mL) is a unit of volume in the metric system, equal to one-thousandth of a litre. It is commonly used to measure liquids, such as water, milk, and other beverages. The millilitre is often used in cooking, medicine, and scientific experiments to ensure precise measurements. In practical terms, a millilitre is roughly equivalent to a small drop of water. For example, a standard teaspoon holds about 5 millilitres, making it a useful reference for measuring small quantities. The millilitre is part of the larger metric system, which includes other units like litre, centilitre, and decilitre.