What are tribloblastic and dribloblastic animals?

Triploblastic animals are organisms that develop from three germ layers: ectoderm, mesoderm, and endoderm, which allows for more complex body structures and systems. Examples include mammals, birds, and reptiles. In contrast, diploblastic animals have only two germ layers, the ectoderm and endoderm, leading to simpler body structures; examples include cnidarians like jellyfish and corals. The distinction between these two groups is significant in understanding evolutionary Biology and developmental processes.