Frogs are amphibians known for their jumping abilities, croaking sounds, bulging eyes, and smooth, moist skin. They are found on every continent except Antarctica, inhabiting a range of environments from rainforests to deserts. Most frogs begin life as aquatic tadpoles before metamorphosing into their adult form. They play an essential role in ecosystems as both predators and prey and are often considered indicators of environmental health due to their sensitivity to pollution and habitat changes.