The meter is the base unit of length in the International System of Units (SI). It was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a meridian through Paris. Today, it is defined in terms of the speed of light, making it incredibly precise. Meters are widely used in scientific, engineering, and everyday contexts worldwide.
A kilometer, equivalent to 1,000 meters, is a metric unit of measurement commonly used to represent distances on land, especially in countries that use the metric system. Kilometers are often used in maps, navigation, and geography to describe distances between cities or landmarks.