A litre is a unit of volume measurement in the metric system, commonly used to quantify liquids. One litre is equivalent to 1,000 millilitres or about 0.264 gallons. It is often used in everyday contexts, such as measuring beverages, fuel, and other liquids. The symbol for litre is "L," and it is widely used around the world, especially in countries that follow the metric system. The litre is also a standard unit in scientific contexts, making it essential for experiments and calculations involving liquid volumes, such as in chemistry and biology.