👉 Kilometre is a unit of length in the metric system. It is equal to 100 meters (m) and is used primarily for measuring distances on land. The kilometer was originally defined as one mile, but it has since been extended to include other units such as kilometers per hour (km/h), kilometers per second (km/s), etc. Kilometre is also commonly abbreviated as km or m. It can be used in a variety of contexts, including measurements