What is the definition of Domain Kingdom Phylum Class Order Family Genus Species?

Domain is the broadest category used in classifying organisms. There are 3 major domains: Eukarya (nucleus-present cell), Archaea (without nucleus), and Bacteria (most primitive organisms in th Earth; Anaerobic) KIngdom is the second broadest. the next categories includes several groups of the classification below them. Species is an individual organism itself.