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 juice. One liter is equivalent to 1,000 milliliters, which is a smaller unit often used in cooking and medicine. In everyday life, you might see liters used on beverage containers, like soda bottles or water jugs. For example, a typical bottle of soda might hold 2 liters. Understanding liters helps people accurately measure and compare the volume of different liquids in various situations.