Organism classification is the scientific method of categorizing living things based on shared characteristics. This system helps scientists organize and identify species, making it easier to study their relationships and behaviors. The primary levels of classification include domain, kingdom, phylum, class, order, family, genus, and species. Each level groups organisms that share specific traits, allowing for a hierarchical structure. For example, humans belong to the species Homo sapiens, which is part of the genus Homo, within the family Hominidae. This structured approach aids in understanding biodiversity and the evolutionary connections among different organisms.