In biology, phylogenetics is the study of evolutionary relatedness among various groups of organisms (for example, species, populations), which is discovered through molecular sequencing data and morphological data matrices. The term phylogenetics is of Greek origin from the terms phyle/phylon ( / ), meaning "tribe, race," and genetikos ( ), meaning "relative to birth" from genesis ( , "birth"). Taxonomy, the classification, identification, and naming of organisms, has been richly informed by phylogenetics but remains methodologically and logically distinct. The fields overlap however in the science of phylogenetic systematics colloquially often called "cladism" or "cladistics" , where only phylogenetic trees are used to delimit taxa, which represent groups of lineage-connected individuals. In biological systematics as a whole, phylogenetic analyses have become essential in researching the evolutionary tree of life.