A "Standard Unit" is a fixed quantity used as a basis for measurement. It provides a consistent way to compare different quantities, ensuring that everyone understands the same amount. For example, in the metric system, the meter is a standard unit for measuring length, while the kilogram is used for mass. Standard units are essential in various fields, including science, engineering, and everyday life. They help avoid confusion and errors when measuring things like distance, weight, or volume. By using standard units, such as meters, kilograms, and liters, people can communicate measurements clearly and accurately.