Charles Darwin is best known for his theory of evolution through natural selection, which had a profound impact on the way organisms are classified. Although he did not develop binomial nomenclature (which was largely the work of Carl Linnaeus), Darwin's ideas about evolution influenced the understanding of relationships among different species.
The theory of evolution led to a new way of thinking about classification systems, emphasizing phylogenetic relationships and common ancestry. This resulted in improvements in taxonomic classifications, where organisms are grouped based on their evolutionary history rather than just physical similarities. Thus, Darwin's contribution to the theory of evolution has had a major impact on the field of biological classification.