Which unit is commonly used to measure length in the metric system?

In the metric system, the meter is the fundamental unit used to measure length. It is defined based on the distance light travels in a vacuum during a specific fraction of a second, making it a universal standard. The metric system is designed to be a decimal-based system, which allows for easy conversion between units; for instance, 1 meter equals 100 centimeters. This ease of use and clarity in measurements is what makes the meter widely adopted for scientific and everyday applications around the world. Other measures like pounds, yards, and feet belong to the imperial system, which is not part of the metric system.