A lizard is a reptile that belongs to the order Squamata, which includes both legless and legged species. They are cold-blooded animals with scaly skin and breathe through their lungs. Lizards typically have four legs, but some species can lose or regenerate their tails. There are over 6,000 different types of lizards found all around the world in various habitats such as forests, deserts, grasslands, and even urban areas. They play an important role in ecosystems by controlling insect populations and serving as prey for other animals.