A deciliter (dL) is a metric unit of volume that is equal to one-tenth of a liter. It is commonly used in various fields, including cooking, nutrition, and science, to measure liquids. For example, a standard cup holds about 2.4 deciliters. In the context of nutrition, deciliters are often used to indicate serving sizes of beverages or ingredients. For instance, a bottle of soda might list its volume in deciliters, helping consumers understand how much they are consuming. This unit is part of the metric system, which is widely used around the world.