Vertebrates are animals that have a backbone or spine, which is part of their internal skeleton. This group includes familiar creatures like mammals, birds, reptiles, amphibians, and fish. The backbone helps protect the spinal cord and provides support for the body, allowing these animals to move in various ways. These animals are part of a larger classification called chordates, which also includes some animals without backbones. Vertebrates are known for their complex structures and systems, such as a well-developed brain and a circulatory system. They can be found in many environments, from oceans to forests, showcasing a wide range of adaptations.