Taxonomy is the practice and science of classification. In taxonomy, plant and animal classifications are organized in the following order; Life, Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species. All plants fall under the Kingdom classification of Plantae. Further down the line, Cannabis starts to differentiate itself under the taxonomic category of Family, belonging to the Family Cannabaceae.
There are two primary methods by which Cannabis plants are propagated. The first is via sexual reproduction where plants are propagated by seeds and designated as a specific plant line or strain. Seed germination is the most basic method for starting a particular strain. Seeds, however, are not always identical reproductions of a singular genotype.