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# Distance
Distance is a [measure](metric.md) of how far away from each other two [points](point.md) are. Most commonly distance refers to physical separation in space, e.g. as in distance of planets from the Sun, but more generally distance may refer to any kind of parameter space and in any number of [dimensions](dimension.md), e.g. the distance of events in time measured in seconds (1D distance) or distance of two text strings as the amount of their dissimilarity ([Levenshtein distance](levenshtein_distance.md)). Distances are very important in [computer science](compsci.md) and [math](math.md) as they allow us to do such things as [clustering](clustering.md), path searching, physics simulations, various comparisons, [sorting](sort.md) etc.
Distance is a [measure](metric.md) of how far away from each other two [points](point.md) are. Most commonly distance refers to physical separation in space, e.g. as in distance of planets from the Sun, but more generally distance may refer to any kind of parameter space and in any number of [dimensions](dimension.md), e.g. the distance of events in [time](time.md) measured in seconds (1D distance) or distance of two text strings as the amount of their dissimilarity ([Levenshtein distance](levenshtein_distance.md)). Distances are very important in [computer science](compsci.md) and [math](math.md) as they allow us to do such things as [clustering](clustering.md), path searching, physics simulations, various comparisons, [sorting](sort.md) etc.
Distance is similar/related to [length](length.md), the difference is that distance is computed between two points while length is the distance of one point from some implicit origin. I.e. distance is computed between two [vectors](vector.md) while length is computed from just one vector.