what is the relation between light year and kilimeter?

A light year is a unit of distance (not time!) equal to the speed of light in a vacuum times the duration of one Julian year--in other words, how far light could travel in a vacuum in a year, assuming no influence by gravitational or magnetic fields. It's used, mostly by laypeople, to discuss the differences in stars. (Professionals prefer the parsec.)

and a kilometer is the conventionally used measurement unit for expressing distances between geographical places in most of the world

kilometre  symbol km is a unit of length in the metric system, equal to one thousand metres and is therefore exactly equal to the distance travelled by light in free space in 1 299,792.458 of a second

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 relation of light year with distance?

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Light year is very far distance but kilometer is short distance
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The relationship between light years or km is they both are measurement of distance they both mean distance light years is a very large amount of distance and km is medium amount of distance
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Light Year and Kilometres both are units to measure distances. The only difference is that Light years are used to measure tooooo big distances, like distance between two galaxies whereas distance between two cities can be measured in Km.
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