Matazoa is a term that refers to a group of multicellular animals, specifically within the kingdom Animalia. It encompasses various phyla, including those that are more complex like Chordata and Arthropoda. The term highlights the evolutionary transition from simple, single-celled organisms to more complex multicellular life forms. In essence, matazoa represents a significant branch in the tree of life, illustrating the diversity and complexity of animal life on Earth.