A liter is a unit of measurement for volume in the metric system. It is commonly used to measure liquids, such as water, milk, and beverages. One liter is equivalent to 1,000 milliliters (mL) and is often represented by the symbol "L." Liters are widely used around the world, especially in countries that follow the metric system. For example, a standard bottle of soda typically contains 1.5 liters. Understanding liters is essential for cooking, science experiments, and various industries, including food and beverage and pharmaceuticals.