Meter:The meter is the base unit of length in the International System of Units (SI). It is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.
Centimeter:A centimeter is a unit of length in the metric system, equal to one-hundredth of a meter. It is commonly used to measure smaller distances, such as the size of objects or the height of people.
Millimeter: A millimeter is a unit of length in the metric system, equal to one-thousandth of a meter. It is used to measure very small distances, such as the thickness of paper or the diameter of a wire.