Biological classification is a system used by scientists to organize and categorize living organisms. This system groups organisms based on shared characteristics, making it easier to study and understand the vast diversity of life on Earth. The main levels of classification include domain, kingdom, phylum, class, order, family, genus, and species. Each level narrows down the group, helping to identify relationships among different organisms. For example, humans are classified as Homo sapiens, where Homo is the genus and sapiens is the species. This classification helps scientists communicate clearly about different organisms and their evolutionary relationships, aiding in research and conservation efforts.