Salamanders are a diverse group of amphibians in the order Caudata, characterized by their elongated bodies, tails, and moist skin. They exhibit remarkable variations in size, habitat, and lifestyle, ranging from fully aquatic to terrestrial species. Notable examples include the lungless salamanders (Plethodontidae), which rely on skin respiration, and the giant salamanders (Cryptobranchidae), some of the largest amphibians in the world.