This document describes the characteristics of the phylum Chordata, which includes humans and other vertebrate animals. Chordata are defined by having a notochord or backbone during development. The phylum contains five subphyla: Hemichordata, Urochordata, Cephalochordata, and Vertebrata. Vertebrata are further divided into seven classes: Agnatha, Chondrichthyes, Osteichthyes, Amphibia, Reptilia, Aves, and Mammalia. The document provides details on characteristics and examples for each group.