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Hierarchical classification is a system of grouping things according to a hierarchy.^[1]

In the field of machine learning, hierarchical classification is sometimes referred to as instance space decomposition,^[2] which splits a complete multi-class problem into a set of smaller classification problems.

^ "Hierarchical Classification". Curriculum Resources for Michigan Agriculture Teachers. Retrieved 23 July 2022.
^ Cohen, S.; Rokach, L.; Maimon, O. (2007). "Decision-tree instance-space decomposition with grouped gain-ratio". Information Sciences. 177 (17). Elsevier: 3592–3612. doi:10.1016/j.ins.2007.01.016.