Placozoa 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 are found in marine environments, often living on the surfaces of coral reefs. These organisms primarily feed on organic matter by absorbing nutrients through their body surface. They reproduce both sexually and asexually, allowing them to adapt to various environmental conditions. Despite their simplicity, Placozoa play a role in the ecosystem by contributing to nutrient cycling.