1 meter is an SI unit (metric system), which was originally defined as one ten-millionth of the distance between the Earth's equator and the North Pole. It is currently defined as the distance light travels in 1/299,792,458 of a second. It is used in various sub-units or multiples such as centimeters, 1/100 meter, and kilometers, which is 1000 meters.
For those using English units, a meter is about 39.37 inches so for rough calculations, it is a little over a yard. A kilometer is about 3/5 of a mile.
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