Frogs are classified as amphibians. This class of animals is characterized by their dual life stages, beginning as aquatic larvae (tadpoles) that breathe through gills before metamorphosing into adults that typically live on land and breathe air through lungs. Amphibians are also known for their moist skin, which plays a vital role in respiration and hydration. Frogs belong to the order Anura and are found in diverse habitats around the world, contributing to ecosystems by serving as both predators and prey. Their unique life cycle and adaptations make them an interesting subject of study in biology and ecology.