Classification, as the name suggests, is a way to organise organisms into categories, so the similar organisms are grouped close together, and the less similar are grouped less closely together. Linnaean taxonomy is a prime example of this, where it uses many categories, progressively narrowing down the number of species at each level until one species (or in some cases, subspecies) stands alone.

Linnaean Taxonomy

(this is the classification system used on this wiki)
Example: Domestic Cat (Felis catus)

Other categories used in linnaean taxonomy include:

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