Placozoans are simple, multicellular organisms that belong to the phylum Placozoa. They are among the most primitive forms of animal life, characterized by their flat, disc-like shape and lack of specialized tissues or organs. Placozoans typically measure just a few millimeters in diameter and can be found in marine environments, often living on the surfaces of coral reefs. These organisms primarily feed on organic matter, such as bacteria and detritus, by absorbing nutrients through their outer layer. Placozoans reproduce both sexually and asexually, and their simple body structure allows them to adapt to various habitats, making them an interesting subject for studying the evolution of multicellular life.