A classification whose usefulness in prediction and explanation is grounded in relevant natural structure, rather than solely in a convenient label. Exact membership conditions can help identify a natural kind but do not alone demonstrate its explanatory significance.
An account of some natural kinds in terms of traits whose association is sustained by causal processes, without requiring every member to possess every trait. For species, shared descent, gene flow and developmental processes can sustain relevant similarities. Whether a cluster supports reliable inference is an empirical issue.[ref]
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A "natural kind" refers to a category or classification of entities that share inherent, fundamental characteristics or properties that are recognized as consistent and universally applicable within a scientific or philosophical context. These categories are often thought to exist independently of human conventions or classifications, meaning they are based on the intrinsic nature of the entities rather than arbitrary groupings. In philosophy, especially in the philosophy of science, natural kinds are seen as crucial for understanding how we categorize and understand the natural world.