A frog is an amphibian known for its smooth, moist skin and long hind legs, which are adapted for jumping. Frogs belong to the order Anura, which includes over 7,000 species found worldwide, except in extreme deserts and polar regions. They typically live in or near water, as they require a moist environment for their skin and reproduction. Frogs undergo a life cycle that includes stages of egg, tadpole, and adult frog. They are carnivorous, primarily feeding on insects, worms, and small invertebrates. Frogs play a vital role in ecosystems as both predators and prey, helping to maintain the balance of their habitats.